River, eastern central New Guinea .
Rising in the central highlands of Papua New Guinea, it flows about 290 mi (470 km) to the Gulf of Papua of the Coral Sea . Its lower course divides into five main channels that lace through a well-settled swampy delta. It is navigable for about 120 mi (190 km). Although found and partially charted in 1887, the river system was not fully traced until the 1930s.