Klasop River
The Klasop or Klasof is a river in the northwest of the Bird's Head Peninsula of New Guinea. Its course generally runs in a southerly direction, and it flows into the bay of Segun, in a large estuary that is connected to that of the Klasagun River to the west. The large island of Jemur separates the two estuaries. The stream of Klawaralim is a left tributary in the upper reach, while in the lower reaches Klasop is joined by a number of right-hand tributaries, including Klamer and Klasafet. For much of its length, Klasop is surrounded by mangrove forests. See also 

 List of drainage basins of Indonesia
 List of rivers of Indonesia

Sources 
 

Rivers of Southwest Papua
Drainage basins of Papua