Senegambian stone circles
The Senegambian stone circles (French: Cercles mégalithiques de Sénégambie), or the Wassu stone circles, are groups of megalithic stone circles located in the Gambia north of Janjanbureh and in central Senegal. Spread across a region 30,000 km2 (12,000 sq mi), they are sometimes divided into the Wassu (Gambian) and Sine-Saloum (Senegalese) circles, but this is purely a national division.
Source: Wikipedia — Senegambian stone circles (CC BY-SA 4.0)