The most famous cave in Iceland is undoubtedly Surtshellir. Its in the Hallmundarhraun lava field. The total length of the cave is approx. 1970 m (6463 ft). The Stefánshellir cave is a direct continuation of Surtshellir to the northeast, and together they are by far the longest cave network of the country – 3500 m (11,483 ft).
The roof of Surtshellir has collapsed in five places, where there are five openings now. The average height of the cave is about 9m (30 ft); it eventually drops to 2-4 m (7-13 ft). The innermost part, where the ceiling is lower is called “the ice cave”, where remarkable ice formations, ice candles and columns form. This part of the cave is thought to be the most beautiful.
Stone-built walls, signs of human habitation in the past, and bones have been found in a part of the cave.
