For the Uros people, who have built and lived on these islands for generations, the totora reed is an essential part of daily living. The reed, which grows in the shallows of Lake Titicaca, can be used as fuel for cooking fires. Its root can be eaten. Its husk can be used for medicinal purposes. And, of course, almost everything is made with the reed: their dwellings, their traditional boats, their watchtowers, the islands themselves, even their trash baskets.
The Uros build the islands by laying down layer upon layer of reeds. But as building materials go, totora reeds don't last long. The sun dries them out during the dry season. Moisture during the rainy season hastens their decay. And the submersed bottom layers gradually decompose. The continual erosion of the Coilas' island means that Nelson has to put down a new layer of reeds every 10 to 15 days.
"Building the island was just the start," he says. "If I stop adding reeds, the island will slowly fall apart. But the more layers I put on, the stronger the island gets over time."