Hasandere is a village in Erfelek District, in Sinop Province, Türkiye. Hasandere lies at 320 m above sea level, in the Küre mountains. It has 218 inhabitants. The nearest city is Sinop, 23 km to the northeast. Among the landmarks around are Alaaddin Mosque (23 km), Carussa (23 km) and Sinop Fortress Prison (23 km). Among the natural features are Tatlıca Waterfalls (14.7 km).