Answer: Lake Titicaca
Lake Titicaca is the highest navigable lake in the world, with an estimated age of 3 million years, located in the Andean high plateau in the central Andes (within the Collao plateau) at an average altitude of 3812 meters above sea level.
This lake is located between the territories of Peru and Bolivia, where 56% of its extension belongs to Peru and 44% to Bolivia, serving as a border between both territories. In addition, it has an average depth of 107 meters and is the largest body of freshwater in South America.