Boa Vista is the easternmost of the 10 islands that make up the Cape Verde archipelago. It is therefore, the island closest to the African continent, being just 450km from Senegal. It has large areas of desert with some impressive sand dunes as shown in this picture. The Deserto de Viana occupies quite a large part of the island. It is one of the best islands for whale watching at the right time of year. Also turtles nest in the Boa Vista sand dunes.