Beylikdüzü is a district in the European side of Istanbul, Turkey, located north of the Sea of Marmara, south of Esenyurt, east of Büyükçekmece, and west of Avcılar.
Wikipedia https://en.wikipedia.org/wiki/Beylikdüzü
Coordinates 41°0'13.514" N 28°38'14.13" E