Lake Titicaca, is undeniably an impressive sight. A National Reserve since 1978, it has over sixty varieties of birds, fourteen species of native fish and eighteen types of amphibians. At 3820m (12,530ft), is the highest navigable lake in the world. At over 170km (105mi) long, it is also the largest lake in South America. Its altitude means the air is unusually clear and the azure waters particularly striking. Interesting boat trips to outlying islands can be made from Puno, the major port on the lake. The area is also known for its folk dances and huge herds of alpacas and llamas.