G-26 Kayalıdere waterfalls are located between Devrek and Ereğli, South of Kayalıdere village. There are 7 waterfalls up to 20 meters high in the canyon extending in the N-S direction at 400-450 meters elevations in the Kayalıdere valley. Kayalıdere valley was occured within the column ‘andesites/basalts’ belonging to the volcanoes that erupted during the Upper Cretaceous period 70-100 million years ago. The valley is covered with broad-leaved forests characteristic of the humid and temperate climate zone of the Western Black Sea Region.