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
Choiseul Province capital of the province. When the natives first arrived and discovered the big island, they called it Lauru. Then, in 1568, the Spanish explorer Álvaro de Mendaña de Neira rediscovered the island and named it San Marcos ('Saint Mark'). Mendana himself never set foot on Lauru. He called it San Marcos, because he saw the island from Santa Isabel on the Day of Saint Mark. 200 years later in 1768, the French explorer Louis Antoine de Bougainville saw the island again and named it Choiseul after the Minister of foreign affairs and statesman Choiseul. Today, the two most common names