Located in the west of Nilufer City center, in the northern hills of Sincan Mountains Lake Uluabat is a tectonic lake which formed by the subsidence of the earth crust and the folowing of this rift with water. In the west of the lake, old and new alluvial terraces, debris cones and travertines can be observed. The length is 25 kilometers in east-west direction, the width is 14 kilometers on the widest part, the acreage is 156 squarekilometers and the depth is average 2,4 meters and maximum 4 meters.
The main feed of Lake Uluabat in which the Nilufer river flow, is Mustafakemelpasa River. Being the 10th biggest of Turkey and estimated to be 1,5 million years old, the main feature of Lake Uluabat is being entitled as 'Living Lake' which only 38 lakes around the world own. Through this feature, Lake Uluabat has been taken under protection in 1998 within the RAMSAR Wetlands Convention. Being a very valuable wetland connected to 'Living Lakes Chain', Lake Uluabat provides nutrition and sheltering to hunderds of types of creatures through avaliable climate conditions, large reed beds, open water surface and nutrient potential.
The Lake Uluabat is also has a very rich variety of species in terms of fishery. In the lake many species such as carp, pike, crayfish, silver pond fish, vimba albumus, roach, rutilus rutilus, tinca tinca, grey mullet, catfish, broad-nosed pipefish, bitterling and monkey goby are living. Another feature of the Lake Uluabat, which has the largest water lily beds of Turkey, is that it is one of the 97 important bird areas of Turkey.
As the Lake Uluabat, which is on the bird migration route that enters Anatolia from the northwest, is very close to Manyas Kus ( Bird ) Lake, it is one of the most important wetlands not only for Turkeybut also Europe and the Middle East in terms of bird fauna. The Lake Uluabat, also receives the Small Cormorant and Dalmatian Pelican which ara globally under the risk of extinction.
There are 9 islands with miscallenous dimensions on the Lake Uluabat. The most important ones are;i the islands on which the Golyazi Quarter is located ( Apollonia ad Ryndacum ), Halilbey ( Alyos ) Island, Nailbey ( Manastir, Monastery ) Island , Kerevit Island, Kizadasi, Terzioglu Island and Arifmolla Island. In both Alyos and Manastir islands there are ruins of the Byzantine era.