The district of Büyükçekmece is located on the coast of Marmara Sea, at the western side of İstanbul. Büyükçekmece, which has a surface area of 18.145 hectares, is surrounded by Çatalca and Arnavutköy districts on the north, Esenyurt district on the east, Beylikdüzü district and Marmara Sea on the south and Silivri district on the west.
The district covers 3,5 % of the surface area of İstanbul. Büyükçekmece is a settlement which is located around the bay of the same name in Marmara Sea, including a lagoon of 29 square-kilometers with the same name and a dam lake.
Besides being one of the important summer resorts of İstanbul with a clean, well-organized coastline of 25 kilometers, Büyükçekmece is also a district of İstanbul that connects the past to the present by preserving the historical heritage at the location. From the viewpoint of urbanism, it is a district deserving to be a world city with its resolved settlement, zoning, infrastructure and environment issues and developing profile.
As per the Law No. 5747 on establishment of districts within metropolitan municipality boundaries and the amendment of some laws, Mimarsinan, Kumburgaz, Celaliye, Kamiloba, Tepecik and Muratbey municipalities of which the legal personalities as first tier municipalities were removed and these municipalities were incorporated into Büyükçekmece Municipality as of 29.03.2009. In addition to these, Pınartepe Neighborhood of Gürpınar first tier municipality and a segment of Kıraç first tier municipality on the west of Hadımköy-TEM link road also came under the authority of Büyükçekmece Municipality as of the same date. After these additions, the total number of neighborhoods within Büyükçekmece district became 23.
The surface area of the district is 185.145 square-kilometers and this territory consists of slightly rough terrain and plains. There are no forests within boundaries of the district.