The Pool Malebo, also known historically as Mpumbu, Lake Nkunda, Lake Nkuna, Lake Ntamo, or Lake Ngobila, is a broad, lake-like widening of the lower Congo River in Central Africa that forms a natural basin where the river expands before descending downstream into the Livingstone Falls. The pool serves as an international boundary between the Republic of the Congo to the north and the Democratic Republic of the Congo to the south, with the national capitals Brazzaville and Kinshasa situated directly opposite one another on its northern and southern shores.