🇵🇪 Peru · The Amazon (Jungle)
Lake Sandoval is one of the natural jewels of the southern Peruvian Amazon, a mirror-still cocha (lagoon) set inside the Reserva Nacional Tambopata, a short way from Puerto Maldonado, in the Madre de Dios region. Ringed by lush jungle and by a characteristic forest of aguaje palms, it is one of the most accessible and rewarding places to have the Amazon experience.
Its great draw is how much wildlife there is and how close it comes: here you can see giant river otters (lobos de río), black caimans, monkeys, a wide variety of birds, turtles and, flying over the aguajales, flocks of macaws and other parrots. Paddling a canoe across its still water at dawn or dusk, among the reflections and the sounds of the jungle, is an unforgettable experience.
This guide covers the essentials of Lake Sandoval with a practical eye: how to get there from Puerto Maldonado (up the Madre de Dios river and then on foot through the jungle), what wildlife to look for, how to organize the visit as a day trip or with an overnight at a lodge, and what to keep in mind in a protected jungle setting. An ideal destination for a first and memorable immersion in the Peruvian Amazon.
Lake Sandoval is a cocha (a lagoon shaped by an abandoned river meander) inside the Reserva Nacional Tambopata, created to protect the extremely high biodiversity of the Madre de Dios Amazon. The area has historically been inhabited by Amazonian peoples and, during the 20th century, was marked by the rubber boom and resource extraction. Today it is one of the icons of ecotourism in Tambopata. The full history is on our history page.
Read the full history ↓The 'biodiversity capital of Peru': southern rainforest of rivers, oxbow lakes and clay licks, home to Manu and Tambopata, two of the richest wildlife sanctuaries in the world, today threatened by gold mining.
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Origins, formation and what the sources say.
The sheet of water that today reflects aguajales and giant otters was, centuries ago, a bend of the Madre de Dios river. Lake Sandoval is a cocha: that is what people in the Amazon call the lagoons that form when a great river abandons one of its meanders. Amazon rivers wind across the plain in wide curves; in time, the river cuts off a meander and follows a straighter course, and the old bend is left isolated, turned into a horseshoe-shaped lagoon. That is how cochas are born, still-water lagoons cut off from the main channel.
These lagoons become extremely rich ecosystems. Being calm water, they encourage the growth of aquatic vegetation, fish, amphibians and abundant wildlife, and they draw numerous species that find food and shelter in them. Lake Sandoval, surrounded by terra firme forest and by extensive aguajales (stands of the aguaje palm), is a remarkable example of this kind of environment, with a microcosm of life concentrated on its shores and in its water.
The aguajales that ring the lake play a key ecological role: the aguaje (Mauritia flexuosa) is a fundamental palm in the Amazon, whose fruit feeds birds, monkeys and other animals and sustains a rich food chain. The combination of cocha and aguajal makes the setting of Lake Sandoval a habitat of extraordinary biodiversity, characteristic of the lowland jungle of Madre de Dios.
The Madre de Dios region, where Lake Sandoval lies, has been inhabited since ancient times by various indigenous Amazonian peoples, with a deep knowledge of the jungle, the rivers and their resources. Some of these peoples keep their presence in the region to this day, including groups in voluntary isolation in more remote areas, which speaks to the cultural importance and the fragility of this territory.
At the end of the 19th century and the beginning of the 20th, Madre de Dios was the scene of the rubber boom, which drew rubber tappers, traders and settlers in search of the wealth of latex. That boom transformed the region, opened up river routes and left a deep —and often tragic— mark on the indigenous populations, in many cases subjected to forced labor and extreme violence by the rubber houses. After rubber declined around 1912-1915, when Asian plantations displaced wild Amazon rubber, other extractive activities shaped the local economy: gathering castaña (the Brazil nut), timber and, more recently and in a very troubling way, gold mining.
The setting of Lake Sandoval and the rivers of the area were part of these dynamics. The city of Puerto Maldonado, founded in 1902 at the confluence of the Madre de Dios and Tambopata rivers, grew as a port and a trading center for the products of the jungle, first rubber and then the Brazil nut. This history of indigenous peoples and extractive cycles forms the backdrop of a territory that would later be recognized for its exceptional natural value.
The extraordinary biodiversity of the Madre de Dios jungle, among the highest on the planet, prompted the creation of protected areas to conserve it against the pressures of deforestation, mining and resource extraction. The direct forerunner was the Zona Reservada Tambopata, established in 1977, which in 2000 was enlarged and recategorized as the Reserva Nacional Tambopata by supreme decree, formally bringing Lake Sandoval within its protected boundaries.
The Reserva Nacional Tambopata, together with other neighboring areas such as Bahuaja-Sonene National Park, forms a great conservation corridor in the south of the Peruvian Amazon that adds up to more than 1.4 million protected hectares in all. It protects ecosystems that hold thousands of species of plants, birds, mammals, reptiles, amphibians and insects, including emblematic and threatened species such as the giant river otter, present at Lake Sandoval, and the jaguar.
The reserve is run by SERNANP (Servicio Nacional de Áreas Naturales Protegidas por el Estado, the national protected areas service), which regulates access, requires visits to be made with authorized tour operators and charges an admission fee that helps fund the conservation and policing of the area.
The giant river otter (Pteronura brasiliensis), the symbol of Lake Sandoval, was hunted intensively through much of the 20th century for its pelt, highly prized on the international fur market. That hunting pressure, together with the degradation of its habitat, drove it to the brink of extinction across wide areas of the Amazon and led to its classification as an endangered species by the International Union for Conservation of Nature (IUCN).
The protection of Lake Sandoval within the Reserva Nacional Tambopata, along with the ban on hunting and on the fur trade, allowed one of the most stable and visible giant otter populations in Peru to recover in this area, making the lake one of the few places in the world where seeing this species in the wild is relatively within reach for a traveler.
Conservation in the area faces persistent challenges, however: informal and illegal gold mining in Madre de Dios, which contaminates rivers with mercury and clears large stretches of forest, is one of the greatest threats to the region, though so far it has affected the interior of the reserve less than its buffer zones. Sustainable tourism around Lake Sandoval, with income that benefits local operators and funds the management of the protected area, has become an argument in favor of conservation over extractive activities.
Since the end of the 20th century, and increasingly over the last few decades, Lake Sandoval has established itself as one of the most visited ecotourism destinations in the south of the Peruvian Amazon, thanks to how relatively close it is to Puerto Maldonado and how easily you can see emblematic wildlife in a short time, without having to head into the jungle for several days. That accessibility made it the usual point of entry for anyone visiting Madre de Dios for the first time.
The growth of tourism brought with it lodges of various categories in the Tambopata area, from budget options to luxury projects such as restored historic haciendas, which generate local jobs and income for the communities and for the running of the reserve. At the same time, the rise in visitor numbers made stricter management rules necessary: limits on motorized boats within the lake (favoring paddles or electric motors), visiting hours and the requirement to go with guides authorized by SERNANP.
Today Lake Sandoval is, for a good share of the travelers who reach Puerto Maldonado, the first and often the most memorable immersion in the Amazon jungle: a sheet of water ringed by aguajales where, in a few hours, you can see giant otters, caimans, monkeys and dozens of bird species, in one of the most biodiverse ecosystems on the planet.