Acısu is a neighborhood in Akçaabat District, in Trabzon Province, Türkiye. Acısu lies at 534 m above sea level, in the Rize Dağları mountains. It has 803 inhabitants. The nearest city is Akçaabat, 13.0 km to the northeast. Beaches nearby: Salacık (15 km). Among the landmarks around are Sumela Monastery (32 km), Hagia Sophia (21 km) and Vazelon Monastery (21 km). Among the natural features are Boztepe Hill (24 km).