Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Istisu — Azerbaijani for 'Hot Water' — is a celebrated thermal mineral spring resort in the Kelbajar district of Azerbaijan, set at high altitude in the Lesser Caucasus mountains where naturally warm sulphurous and carbonated mineral waters have been prized for centuries. The springs of Istisu were renowned throughout the Soviet Union as a thermal destination, and the resort continues to attract visitors within a long thermal tradition. The combination of high-altitude mountain scenery and genuine mineral water makes Istisu one of the most distinctive wellness destinations in the South Caucasus.
Insider tip — Istisu — meaning 'hot water' in Azerbaijani — is one of Azerbaijan's most celebrated mineral spring resorts, located in the mountainous Kelbajar district at the heart of the Lesser Caucasus. The spring emerges at a vigorous 64°C from volcanic rock, rich in hydrogen sulfide and minerals, and must be cooled before bathing. The spectacular alpine setting, surrounded by peaks exceeding 3000 m, made Istisu a renowned wellness destination throughout the Soviet era.