Rennell is situated in the Western Pacific and is the southernmost of the
Solomon Islands, being some . It is the largest uplifted coral
atoll in the world, occupying . It is mostly clad in dense forest and in the centre of the south end of the island is
Lake Tegano (also known as Te Nggano), which was at one time the atoll's
lagoon; the surface of the lake is at sea level and the water is brackish. It is surrounded by cliffs and contains a number of small limestone islands. East Rennell, designated as a World Heritage Site in 1998, is at the southern end of the island; the site includes Lake Tegano, the land surrounding it, and the marine areas stretching for three nautical miles from the island. The site is unspoiled, prone to damage by
cyclones, and is "considered to be a true natural laboratory for scientific study." ==History==