Lost River Hot Springs Adventure

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Quick Details

Thermal Canyon & Springs

The centerpiece of the 600-acre private reserve is the Rio Perdido, which means lost river. This 150-foot, thermo-mineral gorge that draws energy from deep magma flows, will cast its spell on anyone that descends to its magical waters for the first time. It’s a completely natural and inspiring setting, unlike any other place on the planet.

Along the riverbed, there are eight registered springs, from which over 4,000 gallons of hot water emanate every minute. At these points, the water is a bit too hot for more than a dip of the foot. But as a result of the spring water mixing with the river’s flow, we have been blessed with dozens of soothing pools of varying temperatures that are absolutely perfect for prolonged bathing. And, just upstream from the springs zone, you can actually swim in cool water. In this unique area, you can literally jump between hot and cold mineral water.

Along the Rio Perdido grows a beautiful forest of Ron Ron, Ojoche, Nispero, Jobo, Ceibo, and Espavel trees that boast canopy heights upwards of 160 feet. This scene makes for a strong contrast with the dwarf forest that grows outside and above the canyon. So there are two very distinct ecosystems occurring adjacent to each other. The canyons behave like long oases, cutting through the arid forest. This has given way to a very interesting mix of local fauna. You are guaranteed to see all sorts of birds, mammals, reptiles, amphibians, and insects.

The trail circuit and a series of bridges, including a 200ft hanging bridge that connects the hotel to the reserve, allow visitors with a sense of exploration to tailor their own unique adventure, each day. There are dozens of destinations within the reserve. You can opt for a short and easy walk to the Yurro Waterfall or you can challenge yourself with a hike up to Las Tumbas. Read more about the myriad of options in our section on hiking.


  • Access to the thermal river, the natural river pools, and the hot springs
  • Use of the mineral pools, each with distinct water temperature and therapeutic water jets
  • Hiking (without a guide), miles of diverse trail circuits, bridges, and panoramic lookouts
  • Volcanic mud body-painting
  • Use of towels and lockers
  • Access to the changing areas and showers
  • Lost River signature lunch

Hiking Trails

  • Chevron down Yurro Waterfall
  • This is a short hike sums approximately 1 km, out and back. It is a relatively flat, yet attractive trail that takes you across the main hanging bridge. The destination is the top of a waterfall. Note that the Yurro’s slate base may be dry from January to May, but it is always beautiful. Please do not walk on the rocks, as there are steep and slippery sections.

  • Chevron down The Medicinal Spring
  • This hike is 2.5 km, out and back. A relatively flat trail that takes you beyond the Yurro Waterfall, through the Miravalles dry forest and then to a denser and taller forest where the spring and streams are located. Old-time residents of the Montano and Santa Fe areas consider this water to have healing properties. It actually tastes a bit like Alka-Seltzer. Our constant lab testing has produced interesting results. The water’s peculiar taste is due to the high concentrations of diluted magnesium.

  • Chevron down Mesa Norte – Panoramic Lookout
  • The total distance is 3.5 km, out and back. The walk begins with a soft ascent through the woods, takes you to an uncovered trail and then to a steeper climb for the last 250m (800 feet) before you get to the small, flat mesa. From the top, (coma) you can see all of the Guanacaste volcanoes, including the Miravalles, the Rincón de la Vieja, and the Tenorio. Because of the complete absence of artificial illumination, this is an amazing place to stargaze, to see the lit domes that mark the distant urban centers, and to appreciate 360 degrees of undisturbed nature under the moonlight.

  • Chevron down Las Tumbas – Panoramic Lookout
  • The shorter version of this walk is 5 km out and back with the option of an 8-10 km loop for those desiring a more challenging hike. The views are comparable if not more impressive than those you can appreciate from Mesa Norte. The eroded volcanic rock formations in this area are amazing. We strongly recommend that you request one of our well-trained guides and plan accordingly so as to not be caught in the dark.

Add Additional Adventures

  • Chevron down Canyon Adventure Ziplining
  • While Costa Rica has dozens of canopy tours with hundreds of ziplines, we have truly innovated with our Canyon Adventure. Under the guidance of renowned adventure designers, we have created a sequence that will please and surprise. Our inspiring Rio Blanco canyon is the main stage for the awesome cable-based adventure, which includes:

    • 15 platforms: 6 of them are rock-based, 9 are suspended on the canyon walls
    • A pendulum cable
    • A 50ft Tarzan swing
    • A 90ft challenge bridge
    • 4 via ferratas* with lengths varying from 15 to over 30 ft
    • 5 ziplines with lengths varying from 260 to over 800 ft
    • Water station in the middle of the circuit
  • Chevron down Whitewater Tubing
  • Absorb the feel of the canyon from the most beloved means of river transportation, the inner tube. At Rio Perdido, we employ modern equipment to safely take you through a magical place. There are parts of the canyon where the rock walls narrow and daylight is scarce. Echoes grow louder and you really get a sense of where you are. If you remain quiet for a bit, you will find that you are not alone. All kinds of birds and monkeys…and, occasionally, some larger mammals, will announce their presence. Look for the hot water spouts along the eastern rock walls. Whitewater tubing at Rio Perdido is awesome.

    Please take note that this activity is not suitable for everyone. While a slow float will take you through most of the trajectory, there are several intense rapids along the way. There is always a chance of making contact with some of the exposed rocks, which can result in bruising and even minor cuts. This is more likely to occur in the dry season, when the current slows and the water level drops, as more rocks become exposed.

    Children under the age of 12 may not participate in whitewater tubing. Participants must be at least 4’7” (140cm) tall and weigh between 80 and 220lbs (36-100kg).