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The Democratic Republic of the Congo (French: République démocratique du Congo), is a country in central Africa with a small length of Atlantic coastline. It is the third largest country (by area) in Africa.

In order to distinguish it from the neighbouring Republic of the Congo, the Democratic Republic of the Congo is often referred to as DR Congo, DRC, or RDC, or is called Congo-Kinshasa after the capital Kinshasa (in contrast to Congo-Brazzaville for its neighbour).

The name "Congo" refers to the river Congo, also known as the river Zaire. (The river name Congo is related to the name of the Bakongo ethnic group). The Democratic Republic of the Congo was formerly, in turn, the Congo Free State, Belgian Congo, Congo-Léopoldville, Congo-Kinshasa, and Zaire (or Zaïre in French). Though it is located in the Central African UN subregion, the nation is economically and regionally affiliated with Southern Africa as a member of the Southern African Development Community (SADC).

DR Congo borders the Central African Republic and Sudan on the North; Uganda, Rwanda, and Burundi on the East; Zambia and Angola on the South; the Republic of the Congo on the West; and is separated from Tanzania by Lake Tanganyika on the East. The country enjoys access to the ocean through a 40-kilometre (25 mile) stretch of Atlantic coastline at Muanda and the roughly nine-kilometre wide mouth of the Congo river which opens into the Gulf of Guinea.

The Congo is situated at the heart of the west-central portion of sub-Saharan Africa and is bounded by (clockwise from the southwest) Angola, the South Atlantic Ocean, the Republic of Congo, the Central African Republic, the Sudan, Uganda, Rwanda, Burundi, Tanzania across Lake Tanganyika, and Zambia. The country straddles the Equator, with one-third to the North and two-thirds to the South. The size of Congo, 2,345,408 square kilometres (905,567 sq mi), is slightly greater than the combined areas of Spain, France, Germany, Sweden, and Norway.

As a result of its equatorial location, the Congo experiences large amounts of precipitation and has the highest frequency of thunderstorms in the world. The annual rainfall can total upwards of 80 inches (200 cm) in some places, and the area sustains the second largest rain forest in the world (after that of the Amazon). This massive expanse of lush jungle covers most of the vast, low-lying central basin of the river, which slopes toward the Atlantic Ocean in the West. This area is surrounded by plateaus merging into savannas in the south and southwest, by mountainous terraces in the west, and dense grasslands extending beyond the Congo River in the north. High, glaciated mountains are found in the extreme eastern region.

The tropical climate has also produced the Congo River system which dominates the region topographically along with the rainforest it flows through, though they are not mutually exclusive. The name for the Congo state is derived in part from the river. The river basin (meaning the Congo River and all of its myriad tributaries) occupies nearly the entire country and an area of nearly one million square kilometers (400,000 sq mi). The river and its tributaries (major offshoots include the Kasai, Sangha, Ubangi, Aruwimi, and Lulonga) form the backbone of Congolese economics and transportation. They have a dramatic impact on the daily lives of the people.

The sources of the Congo are in the highlands and mountains of the East African Rift, as well as Lake Tanganyika and Lake Mweru. The river flows generally west from Kisangani just below Boyoma Falls, then gradually bends southwest, passing by Mbandaka, joining with the Ubangi River, and running into the Pool Malebo (Stanley Pool). Kinshasa and Brazzaville are on opposite sides of the river at the Pool (see NASA image). Then the river narrows and falls through a number of cataracts in deep canyons (collectively known as the Livingstone Falls), and then running past Boma into the Atlantic Ocean. The river also has the second-largest flow and the second-largest watershed of any river in the world (trailing the Amazon in both respects). The river and a forty-kilometre-wide strip of land on its north bank provide the country's only outlet to the Atlantic.

The previously mentioned Great Rift Valley, in particular the Eastern Rift, plays a key role in shaping the Congo's geography. Not only is the northeastern section of the country much more mountainous, but due to the rift's tectonic activities, this area also experiences low levels of volcanic activity. The geologic activity in this area also created the famous African Great Lakes, three of which lie on the Congo's eastern frontier: Lake Albert (known previously as Lake Mobutu), Lake Edward, and Lake Tanganyika. Perhaps most important of all, the Rift Valley has exposed an enormous amount of mineral wealth throughout the south and east of the Congo, making it accessible to mining. Cobalt, copper, cadmium, industrial and gem-quality diamonds, gold, silver, zinc, manganese, tin, germanium, uranium, radium, bauxite, iron ore, and coal are all found in plentiful supply, especially in the Congo's southeastern Katanga region.

On January 17, 2002 Mount Nyiragongo erupted in Congo, with the lava running out at 40 mph (60 km/h) and 50 yards (50 m) wide. One of the three streams of lava flowed through the nearby city of Goma, killing 45 and leaving 120,000 homeless. Four hundred thousand people were evacuated from the city during the eruption. The lava poisoned the water of Lake Kivu, killing fish. Only two planes left the local airport because of the possibility of the explosion of stored petrol. The lava passed the airport but ruined the runway, entrapping several airplanes. Six months after the 2002 eruption, nearby Mount Nyamuragira also erupted, and again more recently in 2006. Both volcanos remain active.