Lualaba River in the context of "Copperbelt"

The Lukuga River (Swahili: Mto Lukuga) is a tributary of the Lualaba River in the Democratic Republic of the Congo (DRC) that drains Lake Tanganyika. It is unusual in that its flow varies not just seasonally but also due to longer term climate fluctuations.

The Congo River, formerly also known as the Zaire River, is the second-longest river in Africa, shorter only than the Nile, as well as the third largest river in the world by discharge volume, following the Amazon and Ganges–Brahmaputra rivers. It is the world's deepest recorded river, with measured depths of around 220 m (720 ft). The Congo–Lualaba–Luvua–Luapula–Chambeshi River system has an overall length of 4,700 km (2,900 mi), which makes it the world's ninth-longest river. The Chambeshi is a tributary of the Lualaba River, and Lualaba is the name of the Congo River upstream of Boyoma Falls, extending for 1,800 km (1,100 mi).

Measured along with the Lualaba, the main tributary, the Congo River has a total length of 4,370 km (2,720 mi). It is the only major river to cross the equator twice. The Congo Basin has a total area of about 4,000,000 km (1,500,000 sq mi), or 13% of the entire African landmass.

The Luvua River (or Lowa River) (Swahili: Mto Luvua) is a river in the Katanga Province of the Democratic Republic of the Congo (DRC). It flows from the northern end of Lake Mweru on the Zambia-Congo border in a northwesterly direction for 350 kilometres (220 mi) to its confluence with the Lualaba River opposite the town of Ankoro. The Lualaba becomes the Congo River below the Boyoma Falls.

The Chambeshi (or Chambezi) River of northeastern Zambia is the most remote headstream of the Congo River (in length) and therefore it is considered the source of the Congo River. (However, by volume of water, the Lualaba River provides a greater streamflow to the Congo.)

The Chambeshi rises as a stream in the mountains of northeast Zambia near Lake Tanganyika at an elevation of 1,760 metres (5,770 ft) above sea level. It flows for 480 km into the Bangweulu Wetlands, which are part of Lake Bangweulu. By the end of the rainy season in May, the river delivers a flood which recharges the wetlands and inundates the Zambesian grasslands to the southeast. The water then flows out of the wetlands as the Luapula River.

Boyoma Falls (Swahili: Maporomoko ya Maji ya Boyoma, French: Chutes de Boyoma, Dutch: Boyomawatervallen), formerly known as Stanley Falls (French: Chutes Stanley; Dutch: Stanleywatervallen), is a series of seven cataracts, each no more than 5 m (16 ft) high, extending over more than 100 km (62 mi) along a curve of the Lualaba River between the river port towns of Ubundu and Kisangani (also known as Boyoma) in the Orientale Province of the Democratic Republic of the Congo. The seven cataracts have a total drop of 61 m (200 ft). They form the largest waterfall by volume of annual flow rate in the world, exceeding both the Niagara Falls and the Iguazu Falls.

The two major cataracts are the first below Ubundu, forming a narrow and crooked stream that is hardly accessible, and the last that can be seen and visited from Kisangani. At the bottom of the rapids, the Lualaba is known as the Congo River. A 1m-gauge portage railway bypasses the series of rapids, connecting Kisangani and Ubundu.