The Gorge of Kourtaliotis is located 22km south of Rethymno and has a length of 3km. It is one of the most spectacular natural attractions of Rethymnon. It starts from the village Koxare and flows between the mountains Kouroupis (984 m) and Xiro Oros (Dry Mountain – 904m). The huge cliffs of the canyon reach a height of 600 meters and are full of openings and caves, where significant fauna species live. The canyon is crossed by the Kourtaliotis River which flows up to Lake Preveli, after merging with Frati Gorge. In its latest part it is called Big River.