The thermal springs at Papallacta emerge at 70°C from volcanic fault lines beneath the Cayambe-Coca Ecological Reserve, channeling mineral water rich in sodium, calcium, magnesium and sulfates into a cascading network of pools that has drawn visitors since pre-Columbian times. The site sits at 3,300 meters above sea level on the eastern slope of the Andes, where the páramo grassland meets the upper rim of the Amazon cloud forest. Indigenous Quijos communities used the springs for ritual bathing long before the Inca road system threaded through the valley; Spanish colonial records from 1570 describe travellers pausing at "aguas calientes de Papallacta" en route between Quito and the lowland missions. The modern resort opened in 1995, designed by architect Diego Benalcázar as a series of terraced pools and stone-lined channels that step down the hillside, integrating the natural hydrothermal gradient into a sequence of cooler and warmer basins. Papallacta hot springs tours depart Quito daily, following the E28 highway through the páramo before descending into the valley where steam rises against forested ridges. The complex now includes nine public pools ranging from 36°C to 40°C, three cold-plunge pools fed by glacial runoff, and a network of hiking trails that loop through polylepis forest and across suspension bridges above the Papallacta River. The water's mineral composition—particularly its sulfate and bicarbonate content—has been studied by Ecuador's National Polytechnic School for its reported therapeutic effects on circulation and joint inflammation. Visitor numbers peak on weekends, when Quito families and international travelers converge on the terraces; weekday mornings remain quieter, with mist clinging to the pools and only the hiss of geothermal vents audible above the river. The resort's elevation means temperatures rarely exceed 15°C outside the pools, even in equatorial sun. Visitors cycle between hot water immersion and exposure to cold air, a hydrotherapy protocol practiced in Andean bathing culture for centuries. The surrounding Cayambe-Coca Reserve protects 403,000 hectares of highland ecosystems; birders on Papallacta hot springs tour tickets record Andean gulls, carunculated caracaras and occasionally the near-threatened black-chested mountain tanager along the access trails. The site's position on the continental divide means the Papallacta River, which originates 200 meters upslope, flows east toward the Amazon basin while the Guayllabamba drainage to the west feeds the Pacific. Day-trip itineraries often pair the springs with stops at Antisana Ecological Reserve or the crater lake of Quilotoa, though the two-hour soak remains the centerpiece of most visits.