Lake Uluabat (Turkish: Uluabat Gölü and Apolyont Gölü) is the name of a freshwater lake in the vicinity of Bursa, Turkey. It is a large lake, covering an area of between 135 and 160 km² depending on the water level, but very shallow, being only 3 m deep at its deepest point. The lake contains eight islands and one other that is sometimes an island and sometimes a peninsula. The largest island is known as Halilbey Island. In the southwest the lake is fed by the Mustafakemalpaşa River, which has formed a silty delta.