Gasa Tsachu Hot Springs

Insider tip — Gasa Tsachu Hot Springs are Bhutan's most revered natural thermal springs, located in the remote Gasa district of northern Bhutan at the foot of the Black Mountains, three days' trek from the nearest roadhead through rhododendron and blue pine forests. The sulfurous waters emerge at 42 degrees in a wooden bathing complex that has served Bhutanese pilgrims, monks, and royalty for centuries — the springs appear in traditional medical texts as curative waters for skin diseases and joint ailments. The trek to reach Gasa is itself one of Bhutan's most beautiful, passing through pristine high-altitude terrain with views of the Himalayas. Permits are required, limiting visitor numbers and preserving the wilderness character.