From there we started our Peru tour – the floating islands of Uros in Lake Titicata, the highest navigable lake in the world. It is huge – and 3,800 meters high. The floating islands are made of reeds, the houses on them are made of reeds, the cooking fires are fueled by reeds, the farmed guniea pigs (yes, they eat them) feed on reeds, and even the children’s jungle bars are made of … reeds.