Located within the Enzanso mountain hut at the base of Mount Enzan in the Northern Alps of Azumino City, Nagano Prefecture, the Juntendo University School of Medicine Alpine Club High Altitude Medicine Research Clinic is an exceptionally rare medical facility situated at an elevation exceeding 2,700 meters. Operated by the university's Alpine Club for the purpose of researching and practicing high-altitude medicine, the clinic offers specialized expertise unique to its location in the Mount Enzan area, which attracts numerous mountaineers. The primary specialty is internal medicine, with its main role being the treatment of altitude-related health issues such as acute mountain sickness and other ailments that climbers may experience during their ascent. Clinic hours extend from 7:00 AM to 9:00 PM, designed to accommodate the activity patterns of mountaineers staying at the mountain hut. English-language services are available, creating an accessible environment for both domestic and international climbers visiting Mount Enzan. As a clinic directly operated by a high-altitude medical research institution, it also contributes to advancing healthcare standards at high elevations.