Somalia is a country in the Horn of Africa. There are five federal member states: Galmudug, Hirshabelle, Jubaland, South West, Puntland and the municipality of Benadir. It is bordered by Ethiopia to the west, the Gulf of Aden to the north, the Somali Sea and Guardafui Channel to the east, and Kenya to the southwest. It has a land area of 637,657 square kilometers. The terrain consists mainly of plateaus, plains and highlands. The coastline is more than 3,333 kilometers long, the longest of mainland Africa. It has been described as being roughly shaped "like a tilted number seven".