Which of these countries has the longest coastline on Africa's mainland?

The Federal Republic of Somalia is a country located in the Horn of Africa. It is bordered by Ethiopia to the west, Djibouti to the northwest, the Gulf of Aden to the north, the Guardafui Channel and Somali Sea to the east, and Kenya to the southwest.

Somalia has the longest coastline on Africa's mainland, and its terrain consists mainly of plateaus, plains and highlands. Climatically, hot conditions prevail year-round, with periodic monsoon winds and irregular rainfall.

The nation has a total area of 637,657 square kilometres (246,201 sq mi) of which constitutes land, with 10,320 square kilometres (3,980 sq mi) of water.

Somalia has several islands and archipelagos on its coast, including the Bajuni Islands and the Saad ad-Din Archipelago: see islands of Somalia.