Kiribati (pronounced Kiribas) consists of 33 low-lying coral atolls. It is sub-divided into three main groups known as the Gilbert Islands, the Phoenix and the Line Islands with the Capital Island being Tarawa. Kiribati is located in the Central Pacific between 173 and 177 East Longitude and 4 north and 3 South Latitude. From North to South, a distance of 800km, and the distance east to west from Tarawa to Christmas Island is some 3,300 km. The coconut palm is the most common form of vegetation. Other vegetation includes pandanus, pawpaw and breadfruit. Fish are found in profusion in all the islands, especially in Christmas Island's lagoon and ocean waters and include bonefish, trevally, wahoo, yellowfin tuna, sailfish, grouper and sharks. Milkfish are raised locally in natural ponds. Extensive populations of birdlife are found on Christmas Island and include shearwater, petrel, tropic bird, frigate birds, terns, noddys and the Christmas Island warbler which is found only on Christmas Island. The main language is I-Kiribati. On the capital Tarawa, English is widely understood but less on the outer islands.