Sazlıdere Dam reservoir is to the northwest and Sea of Marmara is to the south. It is surrounded by other second-level districts of Istanbul, such as Eyüp, Sultangazi, Esenler, Bağcılar, Küçükçekmece, Avcılar, Esenyurt and Arnavutköy. (Istanbul is one of the 30 metropolitan centers in Turkey with more than one municipality within city borders.)