A global compendium of warm water
Soak in the world's most beautiful waters
Every hot spring, bathhouse, and bathing tradition on earth — gathered into one calm, unhurried atlas for the curious soaker.
8,503+
Places mapped
12
Bathing traditions
114+
Countries
1,002
Feet — record depth
Four ways to soak
Soaking traditions
~27,000 onsen across Japan
Japanese Onsen
Three thousand years of mineral bathing woven into ritual and landscape.
~4,000 historic hammams remain
Turkish Hammam
Steam, marble, scrub and foam — the Ottoman ritual of purification.
118 springs beneath Budapest
Hungarian Thermal
Neo-Baroque palace baths over Roman springs, in the spa capital of the world.
Thousands uncatalogued worldwide
Wild Soaking
Backcountry springs with no facilities, no fees — just water and landscape.
Architecture, ritual & warmth
Bathhouses to know
Russian Banya San Francisco, United States
Archimedes Banya
A San Francisco banya with heated floors, advanced ventilation, and a distinctive Turkish Hammam — high-heat treatments, venik whisks, and a rooftop deck overlooking the bay.
American Bathhouse New York, United States
Bathhouse Flatiron
A modern spa in a transformed subterranean parking lot — six varying thermal pools, three sauna types, and candlelit amenities for relaxation.
Icelandic Lagoon Reykjanes Peninsula, Iceland · Since 1987
Blue Lagoon
Milk-blue silica water in a lava field. The most photographed geothermal pool on earth.
American Bathhouse Hot Springs, Arkansas, United States · Since 1832
Buckstaff Bathhouse
The last original bathhouse on Bathhouse Row still offering traditional thermal bathing. In continuous operation since 1912.
Turkish Hammam Istanbul, Turkey · Since 1584
Çemberlitaş Hamamı
Designed by Mimar Sinan in 1584. The gold standard of Ottoman hammam architecture.
Japanese Onsen Matsuyama, Japan · Since 1894
Dogo Onsen Honkan
The oldest onsen in Japan. Possibly the inspiration for Spirited Away's bathhouse.
Superlatives
The records wall
Deepest spring
1,002 ft
Mother Spring
Pagosa Springs, Colorado
The deepest geothermal spring ever measured on earth.
Oldest bathhouse
~3,000 yrs
Dōgo Onsen
Matsuyama, Japan
In continuous operation since approximately 1000 BC.
Largest pool
1,000,000 gal
Glenwood Hot Springs
Colorado, USA
405 ft long — the world's largest outdoor thermal pool.
Highest altitude
4,400 m
Termas de Polques
Bolivian Altiplano
A soakable spring at 14,400 ft above sea level.
Most colorful
87°C
Grand Prismatic Spring
Yellowstone, USA
Bacteria paint five color rings around the scalding center.
Most remote
−40°C
Liard River Hot Springs
British Columbia, Canada
Accessible year-round, even through deep sub-zero winters.
Wild, resort & natural monument
From the springs atlas
Reykjanes Peninsula, Iceland
Blue Lagoon
Opaque blue-white water in a field of black lava. Nothing else looks like this.
Saturnia, Tuscany, Italy
Cascate del Mulino
Travertine waterfalls at exactly 37°C. Free. Tuscan. Eternal.
Midway Geyser Basin, Yellowstone, United States
Grand Prismatic Spring
The largest hot spring in the US. A rainbow of heat-loving bacteria. Do not touch the water.
Hidalgo, Mexico
Grutas de Tolantongo
Turquoise thermal rivers through limestone caves. One of the most visually extraordinary springs anywhere.
The whole collection
8,503 places, and growing
Beyond the featured few, the atlas gathers every spring and bathhouse we can find — imported from open data across 114+ countries. Browse them all, by list, map or country.
Begin where the water is warm
Every spring has a story.
Every bathhouse, a ritual.
From Ottoman domes in Istanbul to volcanic lagoons in Iceland, from a free wild spring in a New Zealand forest to the oldest bathhouse on earth.