Locals have a phrase for this valley: un paisaje pintado por Dios, a landscape painted by God. It is hard to argue. The Futaleufú gathers itself from the glacial meltwater of Los Alerces National Park in Argentina, then carves a gorge that plunges as much as 1,700 meters below the glaciated peaks crowding overhead. It is one of only two rivers that cross the long Argentina-Chile border, flowing west from its Argentine headwaters into Chile, where it eventually swells Yelcho Lake and runs on to the Pacific. Its name comes from Mapuche, the language of the people who lived here long before any kayaker arrived. Futaleufú means, simply and accurately, Big River. The water itself is the first thing visitors notice, an electric, opaque turquoise produced by glacial till, finely ground rock flour suspended in the current and catching the light like liquid gemstone. Locals shorten the name affectionately to the Futa, or simply the Fu.

For all its fame, the Futaleufú was paddled remarkably late. The first kayakers, Lars Holbek, Eric Magneson, Phil DeRiemer, and Mark Allen, ran it only in February 1985. A raft expedition led by Steve Curry tried the same year and was stopped at Terminator. Not until 1991 did a team led by Eric Hertz and Chris Spelius finally complete the entire whitewater section by raft. The river drops through distinct movements, Upper, Middle, and Lower, with difficulty ranging from gentle Class II to terrifying Class V+. The upper 22 kilometers are the most punishing, packing six Class V rapids and a relentless stretch paddlers call the Wild Mile. Tributaries add their own drama: one gorge on the Río Espolón is named, ominously, the Devil's Throat.

A river this powerful is a river someone wants to dam. On the Argentine side, the Futaleufú is already harnessed, where a 120-meter dam finished in 1978 drowned three natural glacial lakes to form the Amutui Quimey Reservoir, sending power to industry far away on the Atlantic coast. For decades the multinational Endesa eyed the wild Chilean stretch, proposing three dams that would have stilled the current and buried the rapids beneath reservoirs. A coalition of Chilean and international groups fought back, framing the Futa as an international treasure, and in October 2014 Endesa quietly dropped the river from its plans. The campaign found unlikely allies, including American environmental lawyer Robert F. Kennedy Jr., and was chronicled in the 2013 documentary Fighting for the Futaleufú.

The threat never fully vanished, since under Chile's heavily privatized system water rights and mining claims could be revived or sold at any time. Then, in 2025, came a milestone many had fought decades to see: the Chilean government formally declared the Futaleufú, along with the nearby Puelo River, an Environmental Flow Reserve, ensuring that a portion of the river will remain free-flowing for the sake of its ecology, the first protections of their kind for Chilean rivers. For the small Chilean town of Futaleufú, the stakes were always more than scenery. This remote corner of Palena once ranked among Chile's poorest regions, and many residents came to believe their future lay not in dams but in the river itself, in the kayakers and anglers and rafters drawn each summer to the most beautiful big water in Patagonia. Each January, the town throws a river festival it calls Futafest, a celebration of the very current others once hoped to drown.