The Kayacık Dam impounds the Ayfinar Deresi, one of the two streams that join south of Gaziantep

Gaziantep

Gaziantep , Ottoman Turkish: Ayintab) previously and still informally called Antep; ʻayn tāb is a city in southeast Turkey and amongst the oldest continually inhabited cities in the world. The city is located 185 kilometres northeast of Adana and 127 kilometres by road north of Aleppo, Syria...

 to form the Sajur River

Sajur River

The Sājūr River is a long river originating in Turkey and flowing into the Euphrates in Syria. It is the smallest of the three rivers joining the Euphrates in Syria, and the only one that joins the Euphrates on its right bank...

. It is located in Gaziantep Province

Gaziantep Province

Gaziantep Province is a province in south-central Turkey. Its capital is the city of Gaziantep which had a population of 853,513 as of 2000. Its neighbours are Adıyaman at north, Şanlıurfa at east, Syria and Kilis at south, Hatay at southwest, Osmaniye at west and Kahramanmaraş at northwest.An...

, Turkey

Turkey

Turkey , known officially as the Republic of Turkey , is a Eurasian country located in Western Asia and in East Thrace in Southeastern Europe...

. The dam was constructed between 1993 and 2005 as part of the Southeastern Anatolia Project

Southeastern Anatolia Project

The Southeastern Anatolia Project is a multi-sector integrated regional development project based on the concept of sustainable development for the 9 million people living in the Southeastern Anatolia region of Turkey...

 (Güneydoğu Anadolu Projesi, or GAP). It is 45 metres (147.6 ft) high and has a volume of 1853000 cubic metres (65,438,076.5 cu ft). The reservoir

Reservoir

A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...

 created by the Kayacık Dam has a surface area of 11 square kilometres (4.2 sq mi) and a volume of 0.117 cubic kilometre (0.0280697927567015 cu mi) and is used to irrigate

Irrigation

Irrigation may be defined as the science of artificial application of water to the land or soil. It is used to assist in the growing of agricultural crops, maintenance of landscapes, and revegetation of disturbed soils in dry areas and during periods of inadequate rainfall...

an area of 200 square kilometres (77.2 sq mi).