Uros Floating Islands: Totora Reed Engineering on Lake Titicaca

A few kilometres east of Puno, in the reed-fringed bay at the western edge of Lake Titicaca, dozens of small islands float on water 3,810 metres above sea level. They are made almost entirely of one plant, the totora reed, and they have to be rebuilt continually by the families who live on them. The Uros floating islands are often described as a curiosity, but they are better understood as working engineering and as home to a living community that has adapted, more than once, to a changing lake and a changing economy. On Day 14 of our South American Small Group History and Culture Tour, the group visits the islands from Puno in the morning, the day after arriving across the Altiplano by train.

Lake Titicaca and the totora reed

Lake Titicaca covers around 8,300 square kilometres of the high Andean plateau, divided between Peru to the west and Bolivia to the east. Its shallow margins are lined with totora, a tall bulrush known to botanists as Schoenoplectus californicus subsp. tatora. It grows in the lake’s shallows in dense green beds, with smooth, spongy stems between one and three metres tall.

Around the lake, totora has many uses. It is cut for roof thatch, mats, baskets and livestock fodder, and bound into the bundled reed boats called balsas. It is also food: lakeside residents eat the pale lower stem, known as chullu, as well as the rootstock and young shoots, all of which are rich in fibre and iodine. In 2013 Peru’s Ministry of Culture declared the Uros’ ancestral knowledge and practices for managing totora part of the Cultural Heritage of the Nation, recognising the skill involved rather than just the islands themselves.

The reed beds are also habitat. Much of the area around the islands lies within the Titicaca National Reserve, created in 1978 to protect about 36,000 hectares of the lake, most of it reed bed. The reserve records 105 bird species, including the flightless Titicaca grebe, which is found nowhere else and breeds among the totora. Hunting water birds and collecting their eggs are long-standing Uros practices that are now regulated under the reserve’s management plans.

How a floating island is built

An island begins below the waterline. Its foundation is made of blocks of the dense, matted root mass of the totora, called q’illi in Peru’s official heritage declaration. As the roots slowly decompose, gas trapped in the mass keeps it buoyant. Builders cut these blocks from the reed beds, once with wooden wedges and now with saws, float them into position and tie them together with rope.

On top of the root base go layers of cut reeds, laid in alternating directions to form a firm, springy platform. The whole island is held in place by ropes tied to eucalyptus poles driven into the lake bed, with stones as additional anchors. Sources differ on the overall depth, but the root base alone is commonly put at one to two metres thick.

An island that is never finished

Because the reeds rot from beneath as they sit in water, an island is never finished. Peru’s Ministry of Culture describes maintenance taking place two or three times a month, with the whole reed surface replaced up to three times a year; other accounts describe fresh reeds being added every few weeks, more often in wet weather. The ministry gives the working life of a well-built island as several decades, though published estimates range from about 25 to 50 years. Houses, built with walls and roofs of woven reed mats, are rebuilt or moved as the surface beneath them is renewed.

That constant labour is the core of the Uros’ engineering. The material is renewable and free, but only to people who know how to cut, cure, layer and anchor it, and who are prepared to keep doing so. The heritage declaration of 2013 recognises exactly that knowledge.

Who are the Uros?

The Uros are one of several Uru communities of the Altiplano, related to the Chipaya of Bolivia, the people of Lake Poopó and the community of Irohito on the Desaguadero River. Their own tradition holds that their ancestors took to the water for protection and freedom of movement, away from more powerful neighbours on the shore such as the Colla and, later, the Inca. That account is part of community memory rather than something archaeology has confirmed; even sympathetic observers note that the origins of the Uros remain uncertain.

Language tells a story of long contact. Over generations the Uros of Puno Bay traded and intermarried with Aymara-speaking communities on the shore, and today they speak Aymara as their first language, with Spanish alongside. The Uru language itself, known as Uchumataqu, fell out of use; linguists record its last fluent speaker, at Irohito in Bolivia, as having died in 2004. In 2018 Peru’s Ministry of Culture announced plans to support its revival, working with Uru speakers from Bolivia. Peru’s Puno provincial council formally recognised the Uros as an indigenous people in 2016.

Mobility, adaptation and life on the islands today

Mobility has always been part of island life, and it has not only meant drifting. Until the mid-1980s most islands lay well out on the lake. After a severe storm in 1986, many families rebuilt closer to Puno, in the more sheltered reed beds of the bay where most of the islands stand today, roughly five to six kilometres from the port.

The community has continued to adapt. Counts vary, but there are dozens of islands, commonly cited at between 60 and more than 90, home to somewhere between 1,200 and 2,000 people. Fishing, crafts and the trade of fish and totora for potatoes and quinoa from the shore still matter. So do modern services: under a rural electrification programme, several hundred households had solar panels by 2018, replacing candles that were a real fire risk in reed houses. Most families now also depend heavily on tourism: Slate and Smithsonian magazine have both reported that more than four in five residents work in it.

That dependence brings real pressures. Writers have criticised short, crowded visits as voyeuristic, while also arguing that tourism managed by the community is the most realistic way of keeping its way of life viable. The weakness of relying on visitors became plain in 2023, when protests in Peru halted tourism to the islands for months and sales collapsed. The lake itself is under strain too. Untreated wastewater from Puno has turned parts of the inner bay green, and in 2023 the head of the reserve’s Puno office reported that drought had dried out around 84 percent of the protected reed beds, the very resource the islands depend on.

What does respectful cultural interpretation require?

Mainly, treating the islands as a community rather than a museum. The Uros are not living in the past, and their islands are not a re-enactment: the reed construction is a practical response to the lake, and the solar panels on reed roofs are part of the same story of adaptation. A good visit explains the engineering, the history and the economics, and gives island families the chance to describe their own lives. On the tour, local guides provide that context.

How long is a visit to the Uros islands?

Visits from Puno usually take about three hours in all, by boat from the town’s port to the bay, with time spent on one island and sometimes a second. On the tour this is the morning of Day 14; after lunch the group drives to the pre-Inca burial towers of Sillustani and its chullpas and visits a Quechua farm before returning to Puno.

What is it like to walk on a floating island?

Soft and springy, like walking on a thick, slightly uneven mattress, and it takes a few steps to trust. The surface is dry on top but can be damp at the edges, and boat landings involve a short step from deck to reed. Wear flat shoes with grip, and accept a steadying hand when stepping on and off the boat. There are no paved paths; distances on the islands themselves are short.

Will the altitude affect a visit to Lake Titicaca?

It may, so pace yourself. At about 3,800 metres the air holds roughly two-thirds of the oxygen most visitors are used to, so walking and climbing feel harder, and the high sun burns quickly even when the air is cold. By the time the group reaches Puno it has already spent several days at altitude in the Sacred Valley and Cusco, which helps. Bring a sun hat, sunscreen and warm layers for the boat, and talk to your doctor about altitude before travelling; our Chile, Peru and Bolivia travel advice covers the practicalities.

The Uros within the Lake Titicaca journey

The islands sit at the centre of three days around the lake. The group arrives in Puno on the Andean Explorer rail journey from Cusco, a full day across the Altiplano. After the Uros and Sillustani, the next morning crosses into Bolivia at Copacabana and continues by hydrofoil to Moon Island and the Island of the Sun, places at the heart of Inca origin myth. Later that day, at Huatajata on the Bolivian shore, the group meets the Limachi family, reed-boat builders known for constructing the RA II and Tigris vessels used on long ocean expeditions. Totora, in other words, runs through the whole lake journey, from island foundations to ocean-going boats.

Our overview of the South America cultural tour route places Lake Titicaca within the wider five-country journey. On the South American Small Group History and Culture Tour, a Program Leader and local guides bring these places together for a small group of up to 16 travellers.