# Papua New Guinea, Fly

Fly River - flows through the southern part of the island of New Guinea, in a short section forms the state border with Indonesia.
The river begins in the Star Mountains, at a 3-kilometer altitude. In the upper reaches of the Fly is very fast, sometimes there are rapids, but they are not so large as to interfere with the movement of boats.

In the middle and lower reaches, the Fly enters the plains, slows down, flows in a southern and then south-eastern direction, breaking up into a large number of branches and oxbow lakes. It flows into the Gulf of Papua Coral Sea, forming a wide estuary. An interesting and impressive phenomenon is the bor wave, which is formed at high tide when sea water rises 240 km up the riverbed.