The Anastasian Wall or the Long Walls of Thrace is an ancient stone and turf fortification located 64 km west of Istanbul, Turkey, built by the Eastern Roman Empire during the late 5th century.
Wikipedia https://en.wikipedia.org/wiki/Anastasian_Wall
Address (Unnamed Road), 34560, Turkey
Coordinates 41°26'49.616" N 28°22'47.325" E