Bilecik Province () is a province in midwest Turkey, neighboring Bursa Province to the west, Kocaeli Province and Sakarya Province to the north, Bolu Province to the east, Eskişehir to the southeast and Kütahya to the south. Its area is 4,179 km2, and its population is 228,673 (2022). 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 region also contains Söğüt, the small town where the Kayi tribe of Turkomans under Osman Gazi united as the Ottoman Turks and founded the Ottoman Beylik which would later develop into the Ottoman Empire which was founded in 1299, and is the source of important archeological as well as cultural artifacts.
The town Bilecik is famous for its numerous restored Turkic peoples houses.
Some other sites of interest in the province are: Osman Gazi and Orhan Gazi Mosques, Seyh Edebali and Mal Hatun mausoleums, Köprülü Mehmet Pasha Mosque, Köprülü Caravanserai, Kaplikaya tombs, Rüstem Pasha Mosque, and Gülalan Pavilion.
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