Thórsmörk (Þórsmörk) is a mountain ridge in Iceland that was named after the Norse god Thor (Þór). It is situated in the south of Iceland between the glaciers Tindfjallajokull Tindfjallajökull and Eyjafjallajökull. The name “Thórsmörk” properly refers only to the mountain ridge between the rivers Krossá, Þröngá, and Markarfljót Markarfljót, but is sometimes used informally to describe a wider area that includes the region between Thórsmörk and Eyjafjallajökull Thórsmörk is one of the most popular hiking areas in Iceland.
In Þórsmörk, the powerful glacial river Krossá winds between the mountains. The valley is closed in between glaciers, Mýrdalsjökull being at the rear end of the valley. This leads to an especially warm climate, better than in the rest of south Iceland. In the protected valley, green vegetation of moss, fern, birchwood, and other small shrubs are found. Thórsmörk is popular amongst hikers. Many different tours are possible, from hiking on the glaciers to trekking (i.e., “Laugavegurinn” up to Landmannalaugar), Fimmvörðuháls over to Skógar or smaller excursions, such as to the canyon Stakkholtsgjá with its waterfall, and five small day treks, to the summits of surrounding peaks, with rewarding views, even in bad weather. The river Krossá is a cold and powerful river coming down from glaciers; a bridge allows pedestrians to cross. Coaches arrive daily from Reykjavík and other towns in Iceland.