Going to Þórsmörk valley requires a big 4×4 car and good knowledge in crossing rivers and driving on gravel roads. The valley is located between Mýrdalsjökull ice cap and Eyjafjallajökull ice cap. If you have the chance to go to Þórsmörk I highly recommend to book a tour with a local company to explore the valley. You can also get a ride with the scheduled bus over the summer time from Hvolsvöllur. In the winter only a few companies operate there. Tour to Þórmörk normally takes a whole day and it‘s so worth it. You will experience the untouched nature, volcanic formation, and big rivers.