Naftalan Spa in the city of Naftalan in central Azerbaijan is a singular spa resort built around the world-unique experience of immersion in naphthenic crude oil — a naturally occurring petroleum that has formed the basis of a thermal tradition unique to this destination for over one hundred years. The traditional Naftalan experience consists of a series of short supervised bath sessions of no more than eight minutes each, overseen by resident spa staff, making Naftalan as much a singular wellness institution as a resort. The surreal and genuinely singular experience of lying in warm brown petroleum — immersed in a substance that fuels the modern industrial world — makes Naftalan a destination of absolute global uniqueness in the landscape of world thermal bathing traditions.
Insider tip — Naftalan is unique globally as the only spa destination where baths are taken in crude naphthenic oil rather than water, a practice developed by Soviet-era sanatoriums. The oil emerges from Cretaceous-age deposits at 37°C in a city purpose-built for spa tourism during the USSR. Visitors undergo precisely timed 8-minute immersion sessions in individual oil-filled bathtubs — an experience found nowhere else on Earth.