Adana, is a city in southern Turkey and a major agricultural, industry and commercial center. It is the fifth most populous city in Turkey. The city is situated on the Seyhan River, 30 kilometres inland from the Mediterranean Sea, in south-central Anatolia. It is the administrative seat of the Adana Province and has a population of 2.1 million, making it the most populated city of the region. Adana-Mersin metropolitan area, with a population of over 6 million, stretches over 70 kilometres from east to west and 25 kilometres from north to south; encompassing the cities of Mersin, Tarsus and Adana.Adana lies in the heart of Çukurova, a geographical, economical and cultural region that covers the provinces of Mersin, Adana, Osmaniye, and Hatay. Home to approximately six million people, the region is mostly a large stretch of flat, fertile land regarded as one of the most agriculturally productive areas of the world.[citation needed]