Lat 2° 0' 0S Long 147° 25' 0E  Island to the east of Manus and Seeadler Harbor.

History
A relatively small Japanese base was established in April of 1942, and had minimal contact with the people of Manus, but did hire some of the Rossum villagers as guides and scouts. The locals were told by the Japanese that "the war was a fight amongst outside nations and the local people were best advised to stay in the safely of the hinterland." German colonist who remained on the island when then Japanese arrived were either killed or imprisoned. The Japanese called the island Hyane.

American Liberation & Base
The main wartime activity was from the American Army 1st Calvalry, recaptured the islands on March 2, 1944. Since Seadler harbor has an excellent harbor, a huge US Naval base was established at Lombrum. This base was a staging area for future operations in New Guinea, and a portion of the Philippines Invasion fleet assembled in Adler Harbour, and staged through the Manus area. Thousands of buildings, shops and sheds were erected. Wharves were constructed in the harbor.

American Mission Against Los Negros
March 1 - 7, 1944

Momote Airfield (Hyane)
Built by the Japanese, expanded by American forces, still in use today as the island's airport.

Mokerang Airfield
Built by the Japanese, expanded by the Americans, disused today

Lombrum
Lat 2° 1' 60S Long 147° 22' 0E Located on Los Negros near the edge of Manus.

Wartime History
American who recaptured the islands on May 18, 1944. The US Navy established a massive base at Lombrum along side Seeadler Harbor. Thousands of buildings, shops and sheds were erected. At Lorengau, supply and repair facilities were created. Wharves and floating dockswere constructed in the harbor.

Salami
After the initial stages of operations, signal communications between Army, Air Corps, and Naval forces were greatly improved by the arrival of the 99th Signal Battalion at Salami on 16 March. This unit took over the switchboards and was responsible for all wire communications on Los Negros until 20 April. On 9 April a radio station and message center was set up at Salami Plantation by a section from the 832d Signal Service Company.

Naval Facilities
Construction begun soon after the landings, were finished by the end of the official campaign. A floating Liberty dock, a fixed Liberty dock, and a pile dock at Mokerang were ready for use. An LST pile dock was almost complete and a pipeline jetty had been built at Porlaka. . Channels into the harbor were also improved and buoyed and a crib dock constructed.