When the wind rises over Lake Titicaca, high in the Andes mountains of South America, the Uros people step out of their homes onto ground that gently moves beneath their feet. Their village is not built on solid land. Instead, it floats on the surface of the lake, resting on a thick mat of dried reeds that the community has woven together by hand.

For hundreds of years the Uros have lived on these floating islands. Long ago, they moved onto the water to protect themselves from more powerful groups on the shore. If an enemy approached, the islanders could simply move their homes to a safer part of the lake. What began as a way to stay safe has become a way of life passed down through many generations.

The islands are made from a tall water plant called totora, which grows thickly in the shallow parts of the lake. The totora reed is remarkable. Its dense, spongy stem traps air, so it floats easily, and it is strong enough to bear the weight of people, homes and even small boats. The same reed is used to build almost everything the Uros need.

Making an island takes patience and skill. First, the builders cut blocks of the natural root layer, which is buoyant, and tie them together to form a base. Then they pile fresh reeds on top in criss-crossing layers, adding more and more until the surface is thick and firm. Because the reeds at the bottom slowly rot in the water, new reeds must be laid on top every few weeks. In this way an island is never truly finished — it is repaired and rebuilt for as long as people live on it.

Caring for an island is shared work. While a single family may look after a small home, a large island is maintained by the whole community, sometimes several families working side by side. This constant effort, handed down from parents to children, can keep an island afloat for decades.

A floating reed island may seem fragile, but it is well suited to its surroundings. However, it does not outperform modern building in every way. A house of brick and concrete lasts longer and needs less repair. Unlike such houses, though, a reed island produces its own building material, costs almost nothing, and can be moved or reshaped whenever the community wishes.

The reed beds do more than support the islands. They clean the lake water, provide nesting places for birds, and shelter the fish that the Uros catch for food. Harvesting the totora carefully even helps the plant to grow back thicker, so the reed beds remain healthy year after year. The floating islands are part of the lake, not separate from it.

The islands have always brought benefits to the Uros themselves. In the past, the reeds gave them food, shelter and boats for fishing and trade. Today, visitors from around the world travel to see the islands, and this tourism brings money into the community. The Uros way of life is now recognised as an important part of the region's cultural heritage, and there are efforts to protect it so that future generations can continue to live on the water.

Glossary
totora: a tall reed that grows in Lake Titicaca
buoyant: able to float
heritage: traditions and ways of life passed down from the past