Horn of Africa periodic monsoon winds and irregular rainfall. Mean daily maximum temperatures range from , except at higher elevations along the eastern seaboard, where the effects of a cold offshore current can be felt. Somalia has only two permanent rivers, the Jubba and the Shabele, both of which begin in the Ethiopian Highlands. About 220 mammals are found in the Horn of Africa. Among threatened species of the region, there are several antelopes such as the beira, the dibatag, the silver dikdik and the Speke's gazelle. Other remarkable species include the Somali wild ass, the desert warthog, the hamadryas baboon, the Somali
Horn of Africa eventually transformed into Islamic Mogadishu, Berbera, Zeila, Barawa and Merka, which were part of the "Berber civilization". The city of Mogadishu came to be known as the "City of Islam" and controlled the East African gold trade for several centuries. During the Middle Ages, several powerful empires dominated the regional trade in the Horn, including the Adal Sultanate, the Ajuran Sultanate, the Warsangali Sultanate, the Zagwe dynasty, and the Sultanate of the Geledi. The Sultanate of Showa, established in 896, was one of the oldest local Islamic states. It was centered in the former Shewa province in central Ethiopia. The