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The thermal waters start their long journey to the east of Leukerbad, in the area between the Majinghorn and Torrenthorn mountains. The rainwater falling on Wysssee and Schwarzsee lakes at between 2,300 and 3,000 metres a.s.l. infiltrates the mountains through a system of steep fissures that lead down to a depth of around 500 metres below sea level. Around the Triassic gypsum, the water is enriched with calcium and sulphates. As it heats up, it rises to the surface and flows out into one of the many springs in Leukerbad.
Tritium measurements have revealed that the water travels along subterranean channels for over 40 years before emerging into the light of day. The extent to which these underground channels come into contact with the crystalline rock of the Aar massif is still the subject of much debate.
Earthquakes, floods, landslides, avalanches, changes in rainfall, and building activity can all have an effect on the flow and properties of the thermal springs.
In Leukerbad 3.9 million liters of 51°C water gush to the surface every day to fill the town’s 30 pools. This is the biggest volume of thermal water all over Europe! Some of the water is rerouted to our Walliser Alpentherme & Spa Leukerbad to fill the indoor and outdoor thermal pools, where guests can bathe at temperatures of between 36 and 40 °C while enjoying spectacular views of the magnificent surrounding scenery.