Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
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Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
A sulfurous hot spring located in Pasaman, West Sumatra, Indonesia. The water, at 38°C (pH 6.5), forms an open-air pool popular for wild bathing amid volcanic surroundings.
Insider tip — Situated near the equator in the volcanic highlands of Pasaman regency, this hot spring emerges along a geothermal fault line in an area where the Sumatran volcanic arc runs parallel to the island's spine. The setting is forested and undeveloped, with water pooling naturally among streamside rocks before flowing into a small river. Minangkabau villages nearby make this a cultural stopover as well as a thermal one. Access is by motorbike along rutted logging tracks and is best undertaken in dry season between June and September.