Russia or Russian Federation (Russian Rossiyskaya Federatsiya), independent republic in eastern Europe and northern Asia, the world’s largest country by area. Russia was once the largest and the most prominent republic of the Union of Soviet Socialist Republics (USSR, or Soviet Union). In 1991 the USSR broke apart and Russia became an independent country.

The USSR had a totalitarian political system in which Communist Party leaders held political and economic power. The state owned all companies and land, and the government controlled production of goods and other aspects of the economy, a system known as a command, or planned, economy. After the collapse of the Soviet Union, Russia began transforming itself into a more democratic society with an economy based on market mechanisms and principles. Russia has made many successful changes: There have been free elections at all levels of government; private ownership of property has been legalized; and large segments of the economy are now privately owned.

The transformation is far from complete, however. In the economic sphere, privatized assets have not been allocated fairly among the population and privatization of land is still in its infancy. Russia must also deal with the large-scale environmental destruction and other problems inherited from the Soviet Union. In the political arena, a stable society based on citizen involvement in local, regional, and national affairs has yet to develop.

The transformation has affected the people of Russia in a variety of ways. Under the Soviet system, Russians became accustomed to having the government define many aspects of their lives. For many, the collapse of the USSR and the Communist ideal created an ideological void, and Russians increasingly turned to traditional and nontraditional faiths to fill that void. The post-Soviet era has also seen an overall decline in Russia’s population, despite the influx of immigrants from other parts of the former Soviet Union. Russia has the lowest life expectancy and the highest infant mortality rate of the industrialized countries. In addition, the incidence of several infectious diseases increased markedly in the post-Soviet era. The social welfare system, already constrained by inadequate funding, was greatly challenged to combat these growing problems.

In general, Russia’s climate is similar to that of Canada. Much of the land lies north of the 50th parallel of latitude and far from the moderating influences of oceans. Like Canada, although colder and with greater temperature extremes in many places, most of Russia has a harsh continental climate. Although climate, and to some degree soils, limit the country’s agricultural wealth, mineral wealth is considerable: Russia’s mineral resources are unmatched by any other country.

Russia’s borders measure more than 20,100 km (12,500 mi). On the north Russia is bounded by extensions of the Arctic Ocean: the Barents, Kara, Laptev, East Siberian, and Chukchi seas. On the east the country is bounded by the Pacific Ocean and several of its extensions: the Bering Strait (which separates Russia from Alaska), the Bering Sea, the Sea of Okhotsk, and the Sea of Japan (East Sea). In the extreme southeast Russia abuts the northeastern tip of North Korea. On the south it is bounded by China, Mongolia, Kazakhstan, the Caspian Sea, Azerbaijan, Georgia, and the Black Sea. On the southwest it is bounded by Ukraine, and on the west by Belarus, Latvia, Estonia, the Gulf of Finland, and Finland. In the extreme northwest, Russia is bounded by Norway. Lithuania and Poland border Kaliningrad Oblast, a Russian exclave on the Baltic Sea.

Administratively, Russia includes 21 republics; 6 territories known as krays; 10 national areas called okrugs; 49 regions, or oblasts; 1 autonomous oblast; and 2 cities with federal status. The capital and largest city is Moscow.

Kurt E. Engelmann contributed the Introduction to this article.

In both total area and geographic extent Russia is the largest country in the world. With an area of 17,075,200 sq km (6,592,800 sq mi), Russia constitutes more than one-ninth of the world’s land area and nearly twice the area of the United States or China. From north to south Russia extends more than 4,000 km (2,400 mi) from Arctic islands in the Barents Sea to the southern border along the Caucasus Mountains. From the eastern coast of the Baltic Sea to Big Diomede Island (Ratmanov Island) in the Bering Strait, Russia’s maximum east-west extent is almost 10,000 km (6,200 mi), a distance encompassing 11 time zones and spanning nearly half the circumference of the Earth. Russia stretches across parts of two continents, Europe and Asia, with the Ural Mountains and Ural River marking the boundary between them.

Russia’s principal islands lie in the Arctic and Pacific oceans and their extensions. Farthest north, in the Arctic Ocean, is Franz Josef Land, an archipelago consisting of about 100 small islands. The other main Arctic islands, from west to east, include the two islands of Novaya Zemlya, Vaygach Island, the group of islands called Severnaya Zemlya, the New Siberian Islands, and Wrangel Island. Between these major islands lie numerous small islands and island chains. In the Pacific Ocean are the Kuril Islands, which extend southwest in an arc from the Kamchatka Peninsula to the main islands of Japan. Russia occupies and administers all the Kuril Islands, although ownership of the southernmost islands is disputed with Japan. The Pacific also includes the large island of Sakhalin, which separates the Seas of Okhotsk and Japan.

Russia contains complex geologic structures and surface formations. Very simply, however, the landmass consists of vast plains in the west and north, and a discontinuous belt of mountains and plateaus in the south and east. The upland and mountainous regions include most of Siberia and extend to the Pacific.

Russia can be divided into several broad geographic regions. From east to west they are the Great European Plain; the Ural Mountains; the mountain systems and ranges along much of Russia’s southern border; and the lowlands and uplands of Siberia, including the West Siberian Plain, the Central Siberian Plateau, and the mountain ranges of northeastern Siberia.

Most of European Russia is part of a rolling plain that arcs across the continent into Russia, where it widens and has an average elevation of about 200 m (about 600 ft). Over millions of years the actions of streams, winds, and glaciers have deposited nearly horizontal layers of sedimentary rocks onto the plain. In some places, these same actions have eroded the softer sedimentary rocks, leaving the hard igneous and metamorphic layers exposed at the surface. The topography is generally rough in these areas of outcropping.

Some surface features owe their origins to glaciation. Among these features are several areas of glacial deposits, such as the Valday Hills, which lie between Moscow and Saint Petersburg. As the glaciers retreated during the last glacial age, which ended about 10,000 to 12,000 years ago, a series of semicircular hills formed at the terminus, or edge, of the glacier. This area, known as a terminal moraine, runs east from the border with Belarus, then north of Moscow to the Arctic coast. For the most part, however, the relief of the Great European Plain is only modest. Much of the northern part of European Russia is very flat and poorly drained, with many swamps and lakes. By contrast, the southern part of European Russia contains rich soils that support most of the region’s agriculture.

The Great European Plain terminates in the east at the Ural Mountains, an old, worn-down series of mountain ranges with an average elevation of about 600 m (about 2,000 ft). The highest elevation (1,894 m/6,214 ft) is Gora Narodnaya. Despite their modest heights, the Urals are important for a wide variety of mineral deposits, including mineral fuels, iron ore, nonferrous metals, and nonmetallic minerals.

The Caucasus Mountains, located between the Black and Caspian seas, comprise two major folded mountain chains divided along their entire extent by lowlands. The northern Greater Caucasus (Bol’shoy Kavkaz) form part of Russia’s southwestern border with Georgia and Azerbaijan. Geologically complex, the mountain system is composed of granite and other crystalline rocks, with some volcanic formations. The Greater Caucasus reach a maximum elevation of 5,642 m (18,510 ft) at El’brus, an extinct volcano that is the highest peak in Europe, as well as Russia’s highest point. Other mountain ranges extend along much of the southern border of central and eastern Siberia to the Pacific Ocean. Among them are the Altay, Sayan, Yablonovyy, and Stanovoy ranges, which merge with the far eastern mountain ranges. All the southern mountain ranges contain valuable mineral resources.

Between the Urals and the Yenisey River lies the West Siberian Plain, vast lowlands that make up perhaps the largest area of level land in the world. At its widest, the region spans about 1,800 km (about 1,100 mi), and it stretches from the Arctic Ocean in the north to the steppes of Central Asia in the south. The lowlands are extremely flat and poorly drained, with many marshes, swamps, and peat bogs. The northern and central parts contain important oil and natural gas deposits.

East of the Yenisey the land rises to form a rolling plateau that stretches to the Lena River. Elevations here average 500 to 700 m (1,600 to 2,300 ft). Throughout the region rivers have eroded the surface and in some places have formed deep canyons. The geologic structure of the plateau is complex; a basement of igneous and metamorphic rocks is topped in many places by thick sedimentary rocks and volcanic lava. The plateau is thought to contain significant deposits of black coal.

East of the Lena River the topography consists of a series of mountains and basins. Peaks in the higher ranges, such as the Verkhoyansk, Cherskiy, and Kolyma, reach maximum elevations of about 2,300 to 3,200 m (about 7,500 to 10,500 ft). Farther east the mountains are even higher and steeper, and volcanic activity is prevalent. On the Kamchatka Peninsula there are 120 volcanoes, including 23 that are active. The highest cone, Klyuchevskaya Sopka, reaches an elevation of 4,750 m (15,584 ft). The mountains continue offshore to form the Kuril Islands, which contain about 100 volcanoes, including 30 that are active.

Russia’s longest rivers are all located in Siberia. The Ob’ and Irtysh rivers form Russia’s largest river system, which is also the largest in Asia and the fourth largest in the world. Together, these rivers flow 5,410 km (3,362 mi) north from western China through western Siberia to the Arctic Ocean. Several tributaries of the Ob’, including the Irtysh, flow through neighboring Kazakhstan. The Amur and its headwaters, the Onon and the Shilka, form Russia’s second longest system, with a total length of 4,416 km (2,744 mi). The Onon flows northeast from Mongolia into southern Siberia, where it joins the Ingoda to form the Shilka, which continues in a northeasterly direction. At the border with China the Shilka joins the Argun to form the Amur, which continues along the border for about 1,600 km (about 1,000 mi) before heading north to the Pacific Ocean. Among individual rivers, the Lena River is longest; it flows 4,400 km (2,700 mi) north through Siberia to the Arctic Ocean from its source near Lake Baikal. The next longest individual rivers are the Irtysh and the Ob’. The Volga, located in European Russia, is the country’s fourth longest river and the longest river in Europe. Together with its two main tributaries, the Kama and Oka rivers, it drains a large eastern portion of the Great European Plain southeast to the Caspian Sea. The fifth longest river, the Yenisey, flows north from Mongolia through central Siberia to the Arctic Ocean. Its main tributary is the Angara River, which flows from Lake Baikal, Russia’s largest freshwater lake. The Yenisey River carries more water than any other stream system in the country. In size of flow, it is followed by the Lena, Ob’ Amur, and Volga rivers. All the other rivers have much smaller flows.

Many other streams and rivers are significant because they serve as transportation routes or power sources in densely populated areas, or because their waters are used for irrigation. Notable among these is the Don River, which lies in the southern portion of European Russia and drains south to the Sea of Azov. On the northern portion of the Great European Plain, the Daugava (Western Dvina) and Narva rivers flow north and west to the Baltic Sea; the Pechora, Northern Dvina, Mezen’ and Onega rivers flow to the Barents Sea and the White Sea. The Terek and Kuban’ rivers originate in the Greater Caucasus and are important for irrigation purposes. The Terek descends steeply from the mountains before flowing east to the Caspian Sea, while the Kuban’ flows west to the Sea of Azov.

During the Soviet period the government was active in building large dams for electric power, irrigation, flood control, and navigational purposes. On some rivers a series of huge reservoirs have transformed the drainage basins. The most extensive construction has taken place on the Volga-Kama system and the Don River on the Great European Plain, and on the upper portions of the Yenisey-Angara system and Ob’-Irtysh system in Siberia. A series of dams on the Volga has significantly slowed the river and decreased the volume of water it can carry. The decline in the flow of the Kuban’ and Don rivers has been even greater. As a result, the rivers retain even more of the pollutants that are discharged into their waters, and the spawning grounds of sturgeon and other fish have been greatly reduced. Many of the dams do not have properly functioning fish ladders, and as a result many fish do not make it past the dams to their spawning grounds. Inadequate or nonexistent wastewater treatment also contributes to the degradation of rivers and lakes.

Many natural lakes occur in Russia, particularly in the glaciated northwestern portion of the country. The Caspian Sea, on Russia’s southern border, is the world’s largest lake in terms of surface area. Although called a sea, it is actually a salt lake that occupies a land depression. Rivers drain into the Caspian, but the deep basin does not fill with water and overflow to the sea. Water escapes only through evaporation; over a period of time the salts that are left behind accumulate in the water, making it salty. Lake Baikal, in southern Siberia, has the largest surface area of any lake entirely within Russia, and it is the largest in the world in terms of volume; it is estimated to contain one-fifth of Earth’s fresh surface water. With a maximum depth of 1,637 m (5,371 ft), Lake Baikal is also the world’s deepest freshwater lake. Russia’s next two largest lakes in terms of surface area are Lake Ladoga and Lake Onega. Located in northwestern Russia, these freshwater lakes are the two largest lakes in Europe.

Russia has the longest continuous coastline of any country in the world. Its coastline stretches 37,650 km (23,400 mi), mostly along the Arctic and Pacific oceans; other coasts lie along the Black Sea and the Caspian Sea in the south. Because the majority of its coast lies in waters that are frozen for many months of the year, Russia has few year-round oceanic outlets. Despite these limitations, Russian shipping and fishing takes place on all the seas.

The broad zones of natural vegetation and soils correspond closely to the country’s climate zones. Summers are too cool for trees in the far north, where tundra vegetation of mosses, lichens, and low shrubs grows instead. Permafrost, or permanently frozen subsoil, is found throughout this region. The ground is frozen to great depths, and even in summer only a shallow surface layer thaws. There is a polar desert zone on several Arctic islands to the north of the tundra zone; the vegetation in this zone consists of a limited number of moss and lichen groupings scattered in patches.

Russia’s forests, located mostly in Siberia, cover more than two-fifths of the country’s total territory, and account for nearly one-fourth of the world’s total forested area. The forest zone has two distinct areas: a large, mainly coniferous forest, or taiga, lies in the north, and a much smaller area of mixed forest lies in the south.

The taiga occupies two-fifths of European Russia and extends across the Urals to cover much of Siberia. Much of the taiga also has permafrost. This vast zone is made up primarily of coniferous trees, but birch, poplar, aspen, willow, and other deciduous trees add to the diversity of the forest in some places. The taiga contains the world’s largest coniferous forest, representing about one-third of the world’s softwood timber. In the extreme northwestern part of the European region, the taiga is dominated by a variety of pines, although significant numbers of fir, birch, and other trees are also present. Eastward to the western slopes of the Urals, pines are still common, but firs predominate. Some regions, however, have stands of trees that are made up almost exclusively of birch. The taiga of the West Siberian Plain consists primarily of various species of pine, but birch is dominant along the southern fringes of the forest. Larch, a deciduous conifer, becomes dominant throughout much of the Central Siberian Plateau and the mountains of eastern Siberia.

Throughout the taiga zone, trees are generally small and widely spaced. Large areas are devoid of trees, particularly where the soil is poorly drained. In these areas marsh grasses and bushes form the vegetative cover. The taiga contains infertile, acidic soils known as ultisols, or podzols.

A mixed forest, containing both coniferous and broad-leaved deciduous trees, occupies the central portion of the Great European Plain between Saint Petersburg and the Ukrainian border. The mixed forest is dominated by coniferous evergreen trees in the north and broad-leaved trees in the south. The principal broad-leaved species are oak, beech, maple, and hornbeam. A similar forest of somewhat different species prevails along the middle Amur River valley and south along the Ussuri River valley. Gray-brown soils are found in the mixed forest zone. Less infertile than the soils of the taiga, these soils can be kept quite productive with proper farming methods and heavy fertilization.

To the south, the mixed forest transitions through a narrow zone of forest-steppe and then passes into the zone of a true steppe. The natural vegetation of a forest-steppe is grassland with scattered groves of trees. However, much of Russia’s forest-steppe has been cleared of its original cover and is now under cultivation. The forest-steppe zone averages about 150 km (about 95 mi) wide and stretches east across the middle Volga Valley and southern Ural Mountains into the southern portions of the West Siberian Plain. Isolated areas of this zone can be found in the southern basins between the mountains of eastern Siberia.

The natural vegetation of a true steppe consists of a mixture of grasses with only a few stunted trees in sheltered valleys. Like the forest-steppe, Russia’s steppe is now mostly under cultivation. It includes the area northwest of the Greater Caucasus and a strip of land that extends east across the southern Volga Valley, the southern Urals, and parts of western Siberia.

Both the forest-steppe and the steppe have fertile soils and together form a region known as the chernozem, or black-earth, belt; this is the agricultural heartland of Russia. Soils in the chernozem belt are high in humus content and have a balance of minerals that is suitable for most crops. The forest-steppe has a better moisture supply than the steppe during the growing season, and consequently it is the best agricultural area of Russia. The chestnut and brown soils of the southern steppe are not as rich in humus as the chernozems to the north, but they are high in mineral content and can be productive with adequate moisture.

Animal life is abundant and varied throughout Russia. The tundra, which spans the Arctic and northern Pacific coasts and encompasses Russia’s offshore Arctic islands, is home to polar bears, seals, walruses, arctic foxes, lemmings, reindeer, and arctic hares. Birdlife includes white partridges, snowy owls, gulls, and loons. Geese, swans, and ducks migrate into the region during summer, a time when huge swarms of mosquitoes, gnats, and other insects emerge. South of the tundra, the taiga is a habitat for elks, brown bears, lynx, sables, and a variety of forest birds, including owls and nightingales. Swamps in this zone have been stocked with muskrats from Canada. Muskrats and squirrels are now the main source of pelts trapped in the wild. The broad-leaved forests of the Great European and West Siberian plains contain boars, deer, wolves, foxes, and minks. There are also a variety of birds, snakes, lizards, and tortoises. The forests in the southern part of far eastern Russia are known for the Siberian tiger—the largest cat in the world—as well as leopards, bears, and deer. The steppe primarily contains rodents such as marmots and hamsters, but there are also a few species of hoofed animals, including antelope. The main beasts of prey are steppe polecats and Tatar foxes. Bird life includes cranes and eagles. The Caucasus region is particularly abundant in wildlife, including mountain goats, chamois, Caucasian deer, wild boars, porcupines, leopards, hyenas, jackals, squirrels, and bears. There is also a variety of game fowl, including black grouses, turkey hens, and stone partridges. Reptiles and amphibians are also numerous in the Caucasus region.

Many animal species are threatened or endangered, including the snow leopard and the Siberian tiger. A great number of threatened or endangered species are found in far eastern Russia, including Chinese egrets, red-crowned cranes, and Nordmann’s greenshanks.

Russia contains the greatest reserves of mineral resources of any country in the world. Although minerals are abundant, many are in remote areas with extreme climate conditions, which makes them expensive to extract.

Russia is especially rich in mineral fuels. The country may hold as much as one-half of the world’s potential coal reserves and may hold larger reserves of petroleum than any other nation. Coal deposits are scattered widely throughout the country; by far the largest fields lie in central and eastern Siberia, but the most developed fields are in western Siberia, the northeastern European region, the area around Moscow, and the Urals. The major petroleum deposits are in western Siberia and the Volga-Urals region. Smaller deposits are found in many other parts of the country. The principal natural gas deposits, of which Russia holds about 40 percent of the world’s reserves, are along Siberia’s Arctic coast, in the North Caucasus region, and in northwestern Russia. The primary iron-ore deposits are found south of Moscow, near the Ukrainian border in an area known as the Kursk Magnetic Anomaly; in this area, vast deposits of iron ore have caused a deviation in the Earth’s magnetic field. Smaller iron ore deposits are scattered throughout the country. The Urals contain minor deposits of manganese. Other important iron alloys—such as nickel, tungsten, cobalt, and molybdenum—occur in adequate or even abundant quantities.

Russia is also well endowed with most of the nonferrous metals. The aluminum ores Russia does have are found primarily in the Urals, northwestern European Russia, and south central Siberia. Copper, on the other hand, is abundant: Reserves are found in the Urals, the Noril’sk area near the mouth of the Yenisey River in eastern Siberia, and the Kola Peninsula. A large deposit east of Lake Baikal became commercially exploitable when the Baikal-Amur Mainline (BAM) railroad was completed in 1989.

Lead and zinc ores are abundant in the North Caucasus, far eastern Russia, and the western edge of the Kuznetsk Basin in southern Siberia. These ores are commonly found with copper, gold, silver, and a variety of rare metals. Russia has some of the world’s largest gold reserves, primarily in Siberia and the Urals. There are mercury deposits in the far northeastern part of Russia. Large asbestos deposits exist in the central and southern Urals and in south central Siberia.

Raw materials for the manufacture of chemicals are also abundant. These include potassium and magnesium salt deposits in the Kama River district of the western Urals. Some of the world’s largest deposits of apatite (a mineral from which phosphate is derived) are in the central Kola Peninsula; other types of phosphate ores are found in other parts of the country. Common rock salt is found in the southwestern Urals and southwest of Lake Baikal. Surface deposits of salt are derived from salt lakes along the lower Volga Valley. Sulfur is found in the Urals and the middle Volga Valley. High-grade limestone, used for the production of cement, is found in many parts of the country, but particularly near Belgorod near the border with Ukraine, and in the Zhiguli Hills area of the middle Volga Valley.

Most of Russia has a harsh climate with long, cold winters and short, relatively cool summers. This is because Russia lies at high latitudes, and because high mountains along the country’s southern border block most maritime tropical air masses from penetrat