A famous eruption occurred in 1918 of Katla Volcano in South Iceland and triggered the largest flood known on Earth in recent times. Today, a river flows through the area, called Múlakvísl. The very root of that river is originated from an ice cave, known as the Katla Ice Cave in the tourist industry. This is the opening of the cave:
The location of the glacial toungue of Kötlujökull can be studied on this map:
Looking closer at Kötlujökull, we find the location of the cave opening:
The most interesting sites are there for a reason. In the case of Kötlujökull, the inner forces meet with the outer forces of snow, ice and water flow. Here the similar conditions for shaping Barnafoss, Geysir and Hekla are mentioned. Barnafoss is shown here below:
Magic Magma 