Dereköy is a neighborhood in Hendek District, in Sakarya Province, Türkiye. Dereköy lies at 156 m above sea level, in the Akçakoca Dağları mountains. It has 863 inhabitants. The nearest city is Ferizli, 11.2 km to the west. Among the landmarks around are Sangarius Bridge (32 km) and SM UC-13 (24 km).
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