Lines drawn on nautical charts to delineate the extent of a country's jurisdiction over its territorial waters, exclusive economic zone, and continental shelf. In this context, it refers to the sea boundaries shared with neighboring countries.

Ring-shaped coral reefs, islands, or series of islets that encircle a lagoon. They are typically formed from the skeletal remains of coral polyps and are characteristic of tropical marine environments.

A subregion of Oceania, comprising of a large number of islands in the southwestern Pacific Ocean. The Solomon Islands are part of this region, known for their volcanic islands and coral atolls.