Rennell Island, locally known as Mugaba, is the main island of two inhabited islands that make up the Rennell and Bellona Province in the Solomon Islands. Rennell Island has a land area of 660 square kilometres (250 sq mi) that is about 80 kilometres (50 mi) long and 14 kilometres (8.7 mi) wide. It is the second largest raised coral atoll in the world with the largest lake in the insular Pacific (Lake Tegano) that is listed as a World Heritage Site. Rennell Island has a population of about 1840 persons of Polynesian descent who primarily speak Renbelian, Pijin and some English.