Discover Bolivia. Includes FREE planning and background information. Lake Titicaca is deservedly awash with gushing clichés. This incongruous splash of sapphire amid the stark plains of the Altiplano is one of the most beautiful sights in the region. Although it is often wrongly described as the highest navigable lake in the world (both Peru and Chile have higher navigable bodies of water), it nevertheless sits at a high 3820m. It is more than 230km long and 97km wide, making it South America’s second-largest body of freshwater after Venezuela’s Lake Maracaibo.