Iceland Volcano Lookout Point Hverfjall in northern Iceland is tephra cone or “tuff ring” volcano. Located to the east of Mývatn volcanic lake, the volcanic explosion crater is 1 km wide and roughly 140 meters deep and is a popular hiking destination. Visitors can easily access many parts of the crater via public hiking trails, where its ridges can reach 200 meters high. Believed to have been created during a volcano eruption, Hverfjall is almost perfectly symmetrical apart from a landslide that took place several years ago, and its dark, captivating colours make it a popular tourist attraction and photography spot. The site is protected, so visitors can only use the two approved hiking trails to access the crater, with all other areas restricted.