[1] The Lualaba River enters the Upemba Depression about 40 kilometres (25 mi) after leaving Lake Nzilo (Delcommune reservoir).

The trough is about 1,000 metres (3,300 ft) above sea level at its southwest end, sloping steeply down to an elevation of 610 metres (2,000 ft), where it flattens out and is filled by lakes and marshes for a distance of 225 kilometres (140 mi) in a belt that is 37 kilometres (23 mi) wide on average.

[2] In 1957 pottery and metal objects were excavated from an Iron Age cemetery discovered at Sanga on the northern shore of the lake.

[3] The site provides evidence for the origins of the Luba people of present-day Zambia and the DRC, thought to be one of the first groups to work with iron in Central Africa.

The soil is fertile, supporting productive farms for crops such as sorghum and millet, while fish and game provided sources of protein.