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. Its area is 4,
The Aegean region is one of the seven geographical regions of Turkey. The largest city in the region is İzmir. Other big cities are Manisa, Aydın, Denizli, Muğla, Afyonkarahisar and Kütahya.