Passage: The Rufiji River lies entirely within Tanzania. The river is formed by the confluence of the Kilombero and Luwegu rivers. It is approximately 600 kilometres (370 mi) long, with its source in southwestern Tanzania and its mouth on the Indian Ocean at a point between Mafia Island called Mafia Channel. Its principal tributary is the Great Ruaha River. It is navigable for about 100 kilometres (62 mi).

Question: How many miles long is the Rufiji?
370