Along the west coast of Peru, a dry, almost rainless desert covers the land. It stretches from where the coastal plain of the Pacific Ocean to the Andes Mountain Range. Many of the mountains in this part of the Andes are volcanos. In the southern part of the Andes is a large highland plain, the Altiplano. Inside the Altiplano is Lake Titicaca, a large lake shared by Peru and its neighbor, Bolivia. Lastly, on the east side of the Andes is a rainy topical forest which stretches to the eastern border of Peru.