Ceyhan is a city and a district in the Adana Province, in southern Turkey, east of Adana. With a population of 157 thousand, it is the largest district of the province, outside the city of Adana. Ceyhan is the transportation hub for Middle Eastern, Central Asian and Russian oil and natural gas. The city is situated on the Ceyhan River that flows through Çukurova plain. The Ceyhan River is dammed at Aslantas to provide flood control and irrigation for the lower river basin around Ceyhan.