Maltepe is a municipality and district of Istanbul Province, Turkey. Its area is 53 km2, and its population is 528,544 (2022). It is on the northern shore of the Sea of Marmara, adjacent to the Kadıköy district to the west, Kartal district to the east and Ataşehir district to the northwest. The mayor of Maltepe is Esin Köymen (CHP).

Kadıköy is a municipality and district on the Asian side of Istanbul Province, Turkey. Its area is 25 km2, and its population is 467,919 (2023). It is a large and populous area in the Asian side of Istanbul, on the northern shore of the Sea of Marmara. It partially faces the historic city centre of Fatih on the European side of the Bosporus. It is bordered by the districts of Üsküdar, to the northwest, Ataşehir, to the northeast, and Maltepe, to the southeast.