Bilecik Province is a province in midwest Turkey, neighboring Bursa to the west, Kocaeli and Sakarya to the north, Bolu to the east, Eskişehir to the southeast and Kütahya to the south, spanning an area of 4,307 km2. The population is 228,334. Most of the province laid down in Marmara Region but eastern parts of Gölpazarı and Söğüt district and districts of İnhisar and Yenipazar remained in Black Sea Region, smaller southeastern parts of Bozüyük and Söğüt remained in Central Anatolia Region and smaller southwestern part of Bozüyük remained in Aegean Region.
The town is famous for its numerous restored Turkish houses. It is increasingly becoming more attractive to tourists. With its rich architectural heritage, Bilecik is a member of the European Association of Historic Towns and Regions. 30 kilometres (19 miles) southeast from Bilecik is Söğüt, a small town, where the Ottoman Empire was founded in 1299.