Raso Island
The island is 3.6 kilometres (2.2 miles) long by 2.8 kilometres (1.7 miles) wide, Its highest point is Monte da Ribeira Ladrão, elevation 164 metres (538 feet) above sea level. The south-western part is a dry, boulder-strewn plain. There is little vegetation apart from an area of grassland in the south-west. The entire coastline consists of rocky cliffs.
Fauna
Raso is now the only home of the critically endangered Raso lark (about 45 pairs). The island has been identified as an Important Bird Area (IBA) by BirdLife International because, as well as the larks, it supports populations of Cape Verde shearwaters (with an estimated 2500–3750 breeding pairs), red-billed tropicbirds (25–40 pairs), Cape Verde barn owls and Iago sparrows, others include Oceanodroma castro. It is one of only two islands where the extinct Cape Verde giant skink has been recorded. The giant wall gecko (Tarentola gigas) and a skink (Mabuya stangeri) still occur.