Tengchong Rehai (Heiße See) Landschaftsgebiet

The Tengchong Rehai, or Hot Sea Scenic Area, is one of the most spectacular geothermal landscapes in southwest China, set in the Qingshui township about ten kilometers southwest of Tengchong's old county seat. Part of a wider volcanic region that has shaped the geology, climate, and culture of western Yunnan, it brings together more than eighty geothermal springs, fumaroles, and boiling pools in a single lush valley. For travelers exploring Tengchong as part of a Yunnan circuit, Rehai is the single most visited natural attraction and a vivid introduction to the geology of the region.

The valley is wrapped in steam throughout the day. Trails wind past boiling springs where water surfaces at temperatures approaching the boiling point, sulfurous fumaroles that hiss from cracks in the rock, and pools whose mineral contents have dyed the surrounding clays in shades of orange, yellow, and pale blue. The most famous individual feature is the Big Boiling Pot, a wide pool of violently bubbling water ringed by mineral deposits that has become the iconic image of the park. Other named features include the Pearl Springs, the Drum-Beating Spring, and the Pregnant Well, each with its own geological story.

Beyond the geology itself, the geothermal resources of Rehai have long been woven into daily life in Tengchong. Locals use the hot water to boil eggs in baskets lowered directly into the springs, and the resulting lightly cooked eggs, with their distinctive soft texture, are sold as a snack at stalls throughout the park. Hot-spring bathing complexes have grown up around the edges of the protected zone, where cooled and treated thermal water fills outdoor stone and wooden pools surrounded by gardens, allowing visitors to experience the warm springs in comfort rather than at their fierce natural temperature.

A typical visit lasts half a day, with options to extend into a longer bathing session at one of the adjacent spas. The walking trails are mostly paved and gently sloped, but visitors should be prepared for steam, sulfur smells, and uneven footing in places. Early mornings and weekdays tend to be quieter, while weekends and Chinese public holidays draw larger crowds from across Yunnan. Spring and autumn are the most pleasant seasons to visit, when the cooler mountain air makes the steam visible against the surrounding forest and the bathing pools feel especially welcome. For anyone curious about the living geology of southwest China, Rehai is one of the most rewarding destinations in the region.