The Nyong (formerly German: Yong) originates 40 kilometers east of Abong Mbang, where the northern rain forest feeds it. The river's length is almost parallel to the lower reaches of the Sanaga River. Its mouth is in Petit Batanga, 40 miles south-southwest of Edéa. In two places, Mbalmayo and Déhané, the river has huge rapids. The first 200 miles of the river, between Abong Mbang and Mbalmayo, are navigable for small boats from April to November.