Deildartunguhver

Deildartunguhver is a hot spring in Reykholtsdalur, Iceland. It is characterized by a very high flow rate for a hot spring (180 liters/second) and water emerges at 97 C. It is the highest-flow hot spring in Europe.

Some of the water is used for heating; it is piped 34 km away to Borgarnes and 64 km away to Akranes.

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.