Koru is a neighborhood in Geyve District, in Sakarya Province, Türkiye. Koru lies at 631 m above sea level, in the Köroğlu mountains. It has 285 inhabitants. The nearest city is Geyve, 12.5 km to the west. Among the landmarks around are Sangarius Bridge (25 km) and Kabia (11.8 km). Among the natural features are Doğançay Waterfall (11.0 km).