Stage: Thórsmörk – Fimmvörðuháls Distance: 10.31 km. Walking time: 5 – 6 h. Accumulated unevenness: positive 998 m/negative 208 m. The most alpine stage of all. We will have to overcome about 1,000 m of unevenness during this stage. We will begin by crossing the river and advancing up the valley to a point where we will take a steep path that we will ascend. Shortly after ascending we will see large precipices next to us and walls and rocks with incredible shapes. As we ascend, we will be able to see more tongues of the Mýrdalsjökull glacier and the valley we came from in the background. After a steep slope, we will access a huge terrace, where we can take advantage of and look out over precipices of more than 500 m high, at the end of the lava river of the Fimmvörðuháls volcano. Shelter accommodation.