The Warangoi River also known as the Adler River, is a river located in the eastern part of the Gazelle Peninsula

Gazelle Peninsula

Gazelle Peninsula is a large peninsula in northeastern New Britain, Papua New Guinea, at ....

  in the northeastern part of New Britain

New Britain

New Britain, or Niu Briten, is the largest island in the Bismarck Archipelago of Papua New Guinea. It is separated from the island of New Guinea by the Dampier and Vitiaz Straits and from New Ireland by St. George's Channel...

, Papua New Guinea

Papua New Guinea

Papua New Guinea , officially the Independent State of Papua New Guinea, is a country in Oceania, occupying the eastern half of the island of New Guinea and numerous offshore islands...

. It flows past the village of Warangoi and out into the Warangoi Bay. It played a part in the Battle of Rabaul

Battle of Rabaul

The name Battle of Rabaul may refer to several military actions which occurred in or near Rabaul, on New Britain in the Bismarck Islands during World War I and the Pacific campaign of World War II....

 early in 1942. Lieutenant Colonel Ishiro Kuwada's men of the 3rd Infantry Battalion captured at least 200 Australian men between the Warangoi River and Vunakanau

Vunakanau

Vunakanau Airfield was an aerodrome located near Vunakanau, East New Britain, Papua New Guinea. The airfield was constructed as a Royal Australian Air Force aerodrome and consisted of a unpaved single runway during World War II. The airfield was captured during the battle of Rabaul in 1942 by the...

.
Virgin rainforest lies along the river basin.