The gorge of Samaria is the longest and one of the most imposing gorges in Europe. Perhaps the most popular trekking path of Greece runs along its course, passing by varied landscapes, water springs, different types of trees, cliffs, pools and impressive rocks. The gorge is 18 kilometres long and its width varies between 150 and 3-4 metres at its narrowest point, which is known as "Sideroportes". The walk down the gorge begins at "Xiloskalo", in Omalós (at an altitude of 1.200 metres). It requires 4 to 8 hours depending on the walking pace.