Bağlarbaşı is a neighborhood in Geyve District, in Sakarya Province, Türkiye. Bağlarbaşı lies at 111 m above sea level, in the Samanli mountains. It has 865 inhabitants. The nearest city is Geyve, 5.6 km to the southwest. Among the landmarks around are Sangarius Bridge (21 km), Nicomedia (41 km) and Kabia (6.2 km). Among the natural features are Doğançay Waterfall (7.0 km).