İznik, the 5th largest lake in Turkey, lies within the borders of Bursa. In ancient times it was called Askania. It takes its name from the city of Iznik, which is located on the edge of it. Iznik Lake, which has a surface area of 297 kilometers, is very watery. It discharges its waters to the Gemlik Gulf and Karsak. You have to take out a taste of this natural beauty as soon as you take a deep breath with the image that works inside and the vineyards, fruit and vegetable gardens around it. It is a tectonic deposit in the southern Marmara region of the Marmara region. It is located to the north east of Bursa Province. The altitude of the lake from the sea level is 85 meters and the deepest place is 64 meters. Iznik Orhangazi districts extend in the east-west direction within the borders. To the north, the southern slopes of the Samanlı mountains descend vertically. Agriculture is being carried out on large plains in the north east and east Iznik, and between Gemlik gulf and lake. The lake, which opens to the Gemlik bay with a narrow stream of 16 kilometers long, is surrounded by mountains reaching 1,350 meters in the west and south-west elevation. The most important river that feeds the waters outside of some of the rivers is River Stream, which is born in the southern skirts of the Samanlı Mountains and named as Üçpınar Creek and pours from the north east coast by taking different arms.
The lake, which is located inside a depression bell, is an extension of the Gemlik gulf in the beginning, while the waters from the Samanlı mountains and the Kathir mountains in the south are completely separated from the bay as a result of the floods they carry. Garsak, which separates the lake waters from the bay and the lake, flows to the Gemlik bay through the throat. In addition, there are some of the most beautiful and largest picnic areas of Turkey around the lake. One side is the pine tree, the other side is the clean Iznik lake. It attracts thousands of people from all over Turkey. The day is also open to tent tourism outside the rest area. The area around the lake until the 1950s, however, was regulated only after the work had been done and was declared as a site area. There are plenty of tea garden and restaurants around the lake. You can have a picnic, if you like, you can enjoy the lake view.