The Laufafell is an imposing tabular range overhanging the Marakajflot river. Not too far from there, the Hrafntinnusker region is well-known by the scientists for its géothermal activity : this wide caldeira is located at the Torfajökull glacier's side and is full smoking gases and bubbling ponds. Every step here is a discovery and a dazzle. We continued our solitary walk until we reached the emerald waters of a small isolated lake called Höfdavatn, and finished facing the huge Frostadavatn lake, in which lava flows slowly disappear.