Karasu is a neighborhood in Karacabey District, in Bursa Province, Türkiye. Karasu lies at 30 m above sea level, 1.4 km from the Anatolian plateau mountains. It has 112 inhabitants. The nearest city is Karacabey, 7.2 km to the southeast. Among the landmarks around are Cyzicus (39 km), Dascylium (23 km) and Miletopolis (18.6 km).