Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Purnamas is a sulfurous hot spring resort in Indonesia whose name, derived from the Indonesian and Sanskrit word for the full moon (purnama), evokes the luminous beauty of moonlit bathing and the cyclical rhythms of natural renewal. The resort harnesses volcanic geothermal mineral waters in a setting designed for relaxation and wellness, with the sulfurous spring waters traditionally valued by bathers for their soothing, restorative qualities and the warmth of volcanic mineral immersion. Guests experience the pleasures of sulfurous volcanic mineral water within an environment that celebrates the connection between Indonesia's extraordinary natural heritage and the restorative traditions of hot spring bathing.
Insider tip — Purnamas is one of the smaller bathing operations clustered below Sibayak's active caldera, catering primarily to domestic tourists from Medan who make the two-hour drive for a highland weekend escape. The sulfurous spring water at 38°C is well-suited for relaxing soaks, and the highland setting at over 1,300 m keeps the surrounding air cool even in the dry season. Entry fees are minimal and go directly to the local family running the facility. Bring a change of dry clothes as humidity lingers after soaking.
