“This war-torn territory is divided by the Moroccan Wall, a 1,600-mile-long, 10-foot-tall fortified berm, or sand wall. At 16 times longer than the Berlin wall was, the Moroccan Wall, also known as “the Berm,” is one of the largest active military barriers. Landmines dot the length of the fortification, making it also the longest minefield in the world.”

source: https://www.atlasobscura.com/places/moroccan-wall-of-western-sahara