Gao is a city of eastern Mali on the eastern reach of the Niger river bend, four hundred kilometres downstream from Timbuktu. The settlement is much older than its medieval Arabic name suggests; archaeological work at Gao-Saney and Gao Ancien has documented continuous occupation back at least to the seventh century CE.
Gao was the capital of the Songhay Empire from approximately 1464 under Sonni Ali through the imperial peak of Askia Muhammad I and his successors to the destruction of the empire by the Saadian expedition at Tondibi in 1591. At its height the Songhay sphere extended from the Atlantic coast at the Senegal-river mouth to the borders of Hausa-land, with Gao as its administrative and ceremonial seat and Timbuktu as its commercial and scholarly counterpart.
The trans-Saharan trade routes from Tlemcen, Sijilmasa, and the Touat oases all terminated at the Gao-Timbuktu axis. Gao functioned as the principal southern receiving city for Saharan salt, manufactured goods, and learning, and as the principal northern shipping point for Sudanese gold, slaves, ivory, and kola. The Tuareg confederations of the surrounding Adrar des Iforas and the broader Iwellemmedan sphere maintained continuous tributary and military relations with the Songhay imperial centre at Gao.
The Tomb of Askia, an unusual stepped-pyramid mudbrick mausoleum built around 1495 to commemorate the Songhay emperor Askia Muhammad I, is the principal surviving Songhay monument. UNESCO inscribed the Tomb in 2004 and added it to the List in Danger in 2012 during the northern Mali crisis. The contemporary city has been at the centre of the post-2012 Malian conflict; its position as the regional administrative capital is reduced and its access to broader Mali constrained by continuing security operations.