Bougainville Strait is one of three major routes for merchant shipping through the Solomon Islands; the routes are the Bougainville Strait and Indispensable Strait which link the Pacific Ocean, Solomon Sea and Coral Sea; and the Manning Strait that links the Pacific to New Georgia Sound, which is also known as ‘The Slot’, through which Japanese naval ships resupplied the garrison on Guadalcanal during the Pacific War. Bougainville Strait Bougainville Strait separates Choiseul Island, part of the Solomon Islands from Bougainville Island, the next to the northward and part of Papua New Guinea. It was first passed through in 1768 by Louis
Malaita 23 miles (37 km) wide at its widest point. Its length is in a north-northwest-to-south-southeast direction, but local custom and official use generally rotate it to straight north-south orientation, and generally refer to the "east coast" or "northern end," when northeast or northwest would be more accurate. To the southwest is the Indispensable Strait, which separates it from Guadalcanal and the Florida Islands. To the northeast and east is open Pacific Ocean, except for the small Sikaiana, part of the province 212 km northeast. To the northwest of the island is Santa Isabel Island. To the immediate southwest is South