Above them Stanley Pool District extended north along the east shore of the Congo River.

[4] It contained the districts of Bas-Congo, Léopoldville, Kwango, Kasai and Sankuru.

[3] With the 1933 reorganization Bas-Congo had been extended again to include a section of Lac Léopold II District along the Congo.

[3] A 1955-1957 map shows that Bas-Congo had been reduced to a small region at the mouth of the Congo, with Cataractes District now extending east and northeast, surrounding the urban district of Léopoldville.

It was renamed Bas-Zaïre from 27 October 1971, Bas-Congo in 1997 and received its current name of Kongo Central in 2015.