Dedeağaç is a village in Ayancık District, in Sinop Province, Türkiye. Dedeağaç lies at 235 m above sea level, in the Küre mountains. It has 109 inhabitants. The nearest city is Sinop, 40 km to the east. Beaches nearby: Ali Köyü (3.4 km), Harzana (3.4 km), Ayancık Köyü (7.8 km). Among the landmarks around are Erfelek Dam (9.6 km). Among the natural features are Tatlıca Waterfalls (12.2 km).