Nigeria is located in western Africa on the Gulf of Guinea and has a total area of , making it the world's 32nd-largest country. Its borders span , and it shares borders with Benin (), Niger (), Chad (), and Cameroon (including the separatist Ambazonia) . Its coastline is at least . Nigeria lies between latitudes 4° and 14°N, and longitudes 2° and 15°E. The highest point in Nigeria is Chappal Waddi at . The main rivers are the Niger and the Benue, which converge and empty into the Niger Delta. This is one of the world's largest river deltas and the location of a large area of Central African mangroves.