As the International Space Station flew over the Atacama Desert of coastal Peru, an astronaut looked to the north and captured the entire 190-kilometer (120-mile) length of Lake Titicaca. The lake lies on the high Andes plateau, along the border between Peru and Bolivia. It is the highest major body of navigable water in the world (3,800 meters or 12,500 feet in elevation) and the largest lake in South America. Lake Titicaca is one of the most popular tourist attractions in South America. Many rivers drain into the lake, including several draining glaciers (top right). A semicircular river delta bulges into the lake (center), while some other rivers enter through protected bays and make dark green wetlands. A green algal bloom appears at the south end of the lake (right). (North is to the top left of the image.)