D.565 is a 407 km (253 mi) long north–south state road from İğneada on the Black Sea to Izmir in western Turkey. The route is broken into two parts by the Sea of Marmara: a 128 km (80 mi) long section in East Thrace from İğneada to Tekirdağ and a 279 km (173 mi) section in Anatolia from Bandırma to Izmir. The gap is connected by a car ferry operating between the two port cities. The route is mostly a four-lane highway except for the first 61 km (38 mi) section at its northern end.[1]
In two separate sections, the D.565 runs concurrently with two other state roads in East Thrace: with the D.020 between Poyralı and Pınarhisar and with the D.100 between Lüleburgaz and Büyükkarıştıran.