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
Santa Isabel Island Maestre de Campo Pedro Ortega Valencia and Alférez Hernando Enríquez resulted in the discoveries of the islands of Malaita, Guadalcanal, Savo, Vangunu, Choiseul, Makira, Ulawa, Malaupaina, Malaulalo, Ali'ite, and Ugi Island. The Spanish immediately came into contact with Solomon Islanders and at first the relationship was cordial. However, the Spanish expedition's need for fresh food and water quickly led to tension and conflict, the Solomon Islanders’ subsistence economy being unable to provide continuous supplies to the Spanish. Having found no gold and little food, and beset by attacks and sickness, the Spanish colonists shifted their colony to the site of