Kütahya (Turkish pronunciation: [cyˈtahja]) (historically, Cotyaeum or Kotyaion, Greek: Κοτύαιον) is a city in western Turkey which lies on the Porsuk river, at 969 metres above sea level. It is inhabited by some 578,640 people (2022 estimate). The region of Kütahya has large areas of gentle slopes with agricultural land culminating in high mountain ridges to the north and west.