Mema

Méma is a region in Mali, Africa. A plain of alluvial deposits, it is situated north of Massina; west of Lake Debo and the Inner Niger Delta; and southwest of the Lakes Region. The now-senescent basin may have been the first settlement area for communities who migrated from distressed homelands of the Sahara during the last two millennia BC. Historically, Mema was one of the smaller Soninke states; it was also at one time a province of Ghana.

...
Wikipedia