Karacabey is a town and district of Bursa Province in the Marmara region of Turkey. It is located just west of the Simav River near its confluence with the Adirnaz River. District of Karacabey borders districts of Mudanya and Nilüfer from east, ones of Mustafakemalpaşa and Susurluk from south, one of Manyas from southwest and Bandırma from west.