Dereköy is a neighborhood in Geyve District, in Sakarya Province, Türkiye. Dereköy lies at 76 m above sea level, in the Köroğlu mountains. It has 164 inhabitants. The nearest city is Geyve, 7.1 km to the southwest. Among the landmarks around are Sangarius Bridge (19.5 km), Nicomedia (41 km) and Kabia (7.6 km). Among the natural features are Doğançay Waterfall (5.2 km).
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