Gaziantep which is on the intersection point of Mediterranean Region and Southeastern Anatolia Region is located on the 38-38 east longitude and 36-37 north latitudes. The city is also a neighboring Syria.
Major part of Gaziantep is located in the western part of Southeastern Anatolia Region and a remaining part of Gaziantep is in the Mediterranean Region. The Amanos(Nur) Mountains separates Gaziantep from Osmaniye at the west, Euphrates River separates the city from Sanliurfa at the west and draws national borders beween two cities.
Gaziantep is surrounded by Birecik and Halfeti districts of Sanliurfa on the east, Bahce district of Osmaniye on the west, Hassa district of Hayat on the southwest, Pazarcik district of Kahramanmaras on the north, Adiyaman on the northeast, Syria on the south, and Kilis on the southwest.
Gaziantep has an area of 6.887km2, and covers about %4,91 of Turkey's total land. Generally the land is mountainous and rough. The city center is 850 meter above the sea level. 49,5% of the land are mountains and 49,3% of the land are plains.
The Sof Mountains which are the continuation of Southeastern Taurus are in the city. Dulukbaba, Sam, Ganibaba and Sarikaya Mountains are also located in the city. The important plains of the city are Islahiye, Barak, Araban, Yavuzeli and Oguzeli.
Karasu passes through Araban plain and joins Euphrates. Bozatli(Merzimen) stream which originates from Sof Mountains; passes from south of Yavuzeli and joins Euphrates. The creek which stays within Turkey and Gaziantep and joins Euphrates is the Nizip Creek. The other important streams of the city are; the Alleben Creek which originates from Sof Mountains, Karacay which originates from Karagol which is north of Islahiye, and Balik Suyu which originates from the southwest of Gaziantep plateau.
Even though Gaziantep has many springs, the city does not have any natural lakes. For this reason; there are many artificial lakes and dams all around the city. Alleben Creek which passes through Gaziantep seperates Sehitkamil and Sahinbey which are main districts of the city.
There are not any national forest around the city. There are human-made forests such as Dulukbaba and Burc forestry which are made up of Turkish pine.
Gaziantep is located on the transition point of Mediterranean and Continental Climates. The southern part of the city is in the Mediterranean climate and generally summers are hot and arid, and winters are cold and rainy. Rainy seasons of the city are winter and autumn seasons. The weather is very hot especially in June, July, August and September and December, January and February are generally very cold. The highest temperature measured in Gaziantep is 44-C and the lowest temperature measured was -17,5-C.
The lowest rain fall in Gaziantep is between June and September. The highest rain fall is in December and January. When the season changes, there are very big temperature differences between day and night. Since the city is away from the sea, the humidity rate is very low in the city. For this reason, the weather is not very rough in the city.