Tulagi, less commonly known as Tulaghi, is a small island in the Solomon Islands, just off the south coast of Ngella Sule. The town of the same name on the island was the capital of the British Solomon Islands Protectorate from 1896 to 1942 and is today the capital of the Central Province. The capital of what is now the state of Solomon Islands moved to Honiara, Guadalcanal, after World War II.

The Solomon Islands, also known simply as the Solomons, is a country consisting of six major islands and over 900 smaller islands in Melanesia, part of Oceania, to the northeast of Australia. It is directly adjacent to Papua New Guinea to the west, Australia to the southwest, New Caledonia and Vanuatu to the southeast, Fiji, Wallis and Futuna, and Tuvalu to the east, and Nauru and the Federated States of Micronesia to the north. It has a total area of 28,896 square kilometres, and a population of 734,887 according to the official estimates for mid 2023. Its capital and largest city, Honiara, is located on the largest island, Guadalcanal. The country takes its name from the wider area of the Solomon Islands archipelago, which is a collection of Melanesian islands that also includes the Autonomous Region of Bougainville, but excludes the Santa Cruz Islands.