The same geological forces that created the mountain ranges also created awe-inspiring gorges throughout the island. Faragi Samarias (Samaria Gorge) is the most famous with a length of 16km, making it the longest gorge in Europe as well as one of the most impressive thousands of tourists take the 6- to 7- hour walk every year. Another less well-known gorge is the Faragi Imbrou (Imbros Gorge) that begins at the plain of Imbros and ends at the Libyan Sea beside Hora Sfakion. The Kotsifou Gorge and the Kourtaliotiko Faragi (Kourtaliotiko Gorge) are only a few kilometres away from one another, near Plakias in the prefecture of Rethimnon. In the western part of Crete there is also the Faragi Agias Irinis and in eastern Crete, the Kilada ton Nekron (Valley of Death), named because of the Minoan graves found there and Ha Gorge, a hard accessible narrow gorge.