Well here we are our fourth country - Peru. We crossed the border without a search of Gerty but for the first time they wanted to see some documents other than our passports and vehicle registration document. We reached Puno by lunchtime. It sits on the shore of Lake Titicaca (8500 square kilometres), the highest navigable lake in the world (3810 metres). It is the 2nd largest lake in South America and the 21st largest in the world. On the lake are several old ...