evidence: Contenido The Ingwavuma River is a river in Swaziland, and a major tributary of the Maputo River. It begins near Nhlangano and runs through the territory of Swaziland, until the town of Nsoko, where after 5 kilometers it crosses the border into South Africa. Already in South African territory, and 6 kilometers southwest of the Ndumo Game Reserve, the Ingwavuma River flows into the Maputo River.