Islam is the dominant religion in North Africa and the Horn of Africa. It has also become the predominant religion on the Swahili Coast as well as the West African seaboard and parts of the interior. There have been several Muslim empires in Western Africa which exerted considerable influence, notably the Mali Empire, which flourished for several centuries and the Songhai Empire, under the leadership of Mansa Musa, Sunni Ali and Askia Mohammed.