Question: On which river is this city that has N'Dolo Airport situated?
Sentence (from "N'Dolo Airport"): N'Dolo Airport (IATA: NLO, ICAO: FZAB) , also known as Ndolo Airport, is a secondary airport in the city of Kinshasa, Democratic Republic of the Congo, located in the commune of Barumbu near the city center.
Relevant evidence: Yes