Lake Titicaca will likely need no introduction but, just in case you know it solely for its bawdy sounding name, here's one anyway. This majestic body of water is believed to be the birthplace of the first Inca king, which makes it, in addition to visually stunning and geographically unique, a place of incredible cultural significance. Its waters are situated on the southeast border between Peru and Bolivia, nestled at a height of 3,811 m (12,500 ft); so, if you've been searching for the highest navigable lake in the world and the largest freshwater lake it South America, consider it found.
The incredible Andean vistas around Titicaca are reason enough to make the 10 hr train ride from Cuzco, however there are plenty of other fascinating features to explore and experience. Be sure to visit the man made Uros Islands, 40+ floating land masses made of reeds which serve as both a local village and (cough, cough) tourist attraction, as well as the beautiful and traditional Taquile Island, which has a culture largely unaffected by 21st century modernization. Adventure opportunities may be limited by the lake's frigid temperatures, but camping and hiking are always a good way to round out a day spent out on the water. Check out our link for more info.
Location:Puno region, Peru, on the Bolivian border