İznik is a town and an administrative district in the province of Bursa, Turkey. The town is at the site of the ancient Greek city of Nicaea, from which the modern name derives. The town lies in a fertile basin at the eastern end of Lake İznik, with ranges of hills to the north and south. As the crow flies, the town is only 90 kilometres southeast of Istanbul but by road it is 200 km around the Gulf of İzmit. It is 80 km by road from Bursa.
İznik has a population of about 15,000. It has been a district centre of the province of Bursa since 1930 but belonged to the district of Kocaeli between 1923 and 1927. It was a township of Yenişehir district between 1927 and 1930.
Wikipedia https://en.wikipedia.org/wiki/İznik
Coordinates 40°25'49.24" N 29°43'20.544" E