Cap-Vert is a volcanic field in Senegal with a surface of 100 square kilometres (39 sq mi). The field covers the Cape Verde peninsula close to Dakar and was active until 600,000 years ago.[1] It consists of a number of outcrops and two 100 metres (330 ft) high hills.[2] The position of the dykes and lava flows has been influenced by local fault systems.[3]