The Osp Valley is a passage through the karst and coastal region of Istria. It extends from below the village of Črni Kal to the sea. The valley was shaped by the Osp River. Osp is also one of the oldest villages in Slovenia, first mentioned in 1067. It was the first villages on the Istrian peninsula to have a Slovene school. The village is well known for its rock walls, which offer free climbing all year long.