Lake Hévíz is located in Hévíz, Hungary, near the western end of Lake Balaton, 8 kilometres (5 mi) from Keszthely.

It is the largest thermal lake in the world which is available for swimming (47,500 square metres (511,286 sq ft) in area). The flow of water is very strong and the water in the lake is completely replenished every 72 hours. Its minimum depth is 2 meters, reaching a maximum depth of 38 meters, exactly at the point where the hot thermal water comes out to the surface.

The water of the lake has a very special composition, containing sulphur, calcium, magnesium and hydrogen carbonate. It is extremely rich in minerals and, as such, is very effective in treating numerous illnesses – to truly combine treatment and relaxation. It is mainly used for the following health problems: rheumatic musculoskeletal disorders, degenerative and chronic joint diseases, osteoporosis, post-op treatment for musculoskeletal surgeries, post-op treatment for slipped disc, nervous system-related complaints arising for mechanical reasons, chronic gynaecological illnesses, chronic back pain, various skin disorders (such as psoriasis).

It is important, however, to remember that you shouldn’t spend more than 30 minutes at a time in the water.