Anastasian Wall
The Anastasian Wall ( Greek: , ) or the Long Walls of Thrace ( Greek: Μακρὰ Τείχη τῆς Θράκης , Turkish: "Uzun Duvar" ) is an ancient stone and turf fortification located west of Istanbul , Turkey , built by the Eastern Roman Empire during the late 5th century . 
<triplet> Istanbul <subj> Turkey <obj> country