Answer: Iceland
Notes: Iceland's popular tourist destination is "Deildartunguhver hot spring". Deildartunguhver is a hot spring in Iceland. It is characterized by a very high flow rate for the hot spring. It is the highest-flow hot spring in Europe. Some of the water is used for heating. A fern called Struthiopteris fallax grows in Deildartunguhver. This fern is the only endemic fern in Iceland, and it does not grow anywhere else in the world.
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