The country is divided into 25 departments and shares borders with Ecuador and Colombia to the north, Brazil to the east and Bolivia and Chile to the south. Geographical variation is large with the Pacific Ocean along the west of the countiy, the Andes mountain chain passing through the centre, and the Amazon jungle in the east. Rapid urbanisation is reinforcing a situation where most people live along the Pacific coast, while the mountains and rainforests are scarcely populated.