Dereköy is a village in Ayancık District, in Sinop Province, Türkiye. Dereköy lies at 211 m above sea level, in the Küre mountains. It has 211 inhabitants. The nearest city is Sinop, 44 km to the east. Beaches nearby: Ali Köyü (1.7 km), Ayancık Köyü (3.8 km), Ayancık (5 km). Among the landmarks around are Erfelek Dam (13.4 km). Among the natural features are Tatlıca Waterfalls (15.7 km).