The Taritatu River is a river in the northern part of the Indonesian province of Papua. During the Dutch colonial era it was known as the Idenburg River. The Taritatu River flows generally westward in the basin north of the island's central mountainous cordillera. Eventually it meets the Tariku River

Tariku River

The Tariku River is a river in the northern part of the Indonesian province of Papua. During the Dutch colonial era it was known as the Rouffaer River. The Tariku River flows generally eastward in the basin north of the island's central mountainous cordillera...

, and at this confluence the two rivers become the Mamberamo River

Mamberamo River

The Mamberamo is a large river on the island of New Guinea, in the Indonesian province of Papua. It is the widest river in Indonesia.The source of the river is formed from the confluences of its upper tributaries, the Tariku and Taritatu Rivers...

, one of the largest rivers on the island of New Guinea

New Guinea

New Guinea is the world's second largest island, after Greenland, covering a land area of 786,000 km2. Located in the southwest Pacific Ocean, it lies geographically to the east of the Malay Archipelago, with which it is sometimes included as part of a greater Indo-Australian Archipelago...

.