Wenquan Bowuguan (literally 'hot spring museum') is located in Arxan, Inner Mongolia. The thermal water here reaches 40°C (pH 7.3), forming an open-air pool popular for wild bathing.
Insider tip — Wenquan Bowuguan — literally the Hot Spring Museum — lies in Arxan, a small city in the Greater Khingan Mountains of Inner Mongolia where volcanic geology creates dozens of distinct spring outlets. The area sits within the Arxan National Geopark, where basalt lava fields and crater lakes surround the thermal sources. Winters are severe, with temperatures dropping below -30°C, making the 40°C pools an extraordinary contrast against snow-covered volcanic rock. Visitors often pair the springs with the nearby Tianchi volcanic lakes just a short drive away.