Lake Titicaca is located on the border of Bolivia and Peru high in the Andes.
It sits 12,500 ft above sea level, making it one of the highest lakes in the world.

Titicaca is notable for a population of people who live on the Uros, a group
of 42 or so artificial islands made of floating reeds (totora, a reed that abounds
in the shallows of the lake). Their original purpose was defensive, and they could
be moved if a threat arose.