This family run business is a unique worldly treasure: A live geologic spa/museum of bubbling water pools, bubbling mud pools, fumaroles and natural mud of different colors found only on this property. You can observe this active crater of approximately 5000 m2, close up. The tour can receive 70 people at once and lasts about 30 minutes.

During the tour you will encounter:

Bubbling mud pools
The bubbling mud pools are holes which receive clay mud. These mud pools which contain thermal sulfrated water are all different temperatures: 80ºC, 100ºC, and 200ºC. This mud is odorless, and can be found in three different colours, gray, brown and yellow. The coloration indicates how deep the pool is: the brown mud indicates a depth of two meters, the grey mud a depth of one meter, and the yellow mud indicates the mud is from the surface and is full of sulfur.

You can select the clay in which you want to bathe and the obtain it from the bubbling mud pool. Whilst waiting 15 or 20 minutes for the clay to cool you can enjoy one of the greatest marvels in the world. After bathing in this volcanic mud your skin will be left feeling fresh and smooth.

Bubbling water pools

The bubbling water pools are emerald green, 2 meters deep and 100 ºC. The bubbling water pool remains at this temperature unless it rains. Las Hornillas runs a hose through this water pool to the bathrooms, to warm water for it's guests. The water in these pools is from the mountains, there are two different color waters, the water with Iron and the water with sulfur.



Fumaroles
Fumaroles are vents from which volcanic gas escapes into the atmosphere. Fumaroles may occur along tiny cracks or long fissures, in chaotic clusters or fields, and on the surfaces of lava flows and thick deposits of pyroclastic flows. They may persist for decades or centuries if they are above a persistent heat source or disappear within weeks to months if they occur atop a fresh volcanic deposit that quickly cools.

Fumaroles, emit a mixture of steam and other gases, and are fed by conduits that pass through the water table before reaching the surface of the ground. Hydrogen sulfide (H2S), one of the typical gases issuing from fumaroles, readily oxidizes to sulfuric acid and native sulfur. This accounts for the intense chemical activity and brightly colored rocks in many thermal areas.