İlimbey is a neighborhood in Geyve District, in Sakarya Province, Türkiye. İlimbey lies at 194 m above sea level, in the Samanli mountains. It has 319 inhabitants. The nearest city is Sapanca, 6.5 km to the northwest. Among the landmarks around are Sangarius Bridge (10.1 km), Nicomedia (37 km) and Sakarya Museum (14.8 km). Among the natural features are Doğançay Waterfall (7.0 km).