Moroccan Western Sahara Wall

The Moroccan Western Sahara Wall or the Berm, also called the Moroccan sand wall (Arabic: الجدار الرملي, romanized: al-jidār ar-ramliyya, lit. 'sand wall'), is an approximately 2,700 km-long (1,700 mi) berm running south to north through Western Sahara and the southwestern portion of Morocco. It separates the Moroccan-occupied areas (the Southern Provinces) on the west from the Polisario-controlled areas (Free Zone, nominally Sahrawi Arab Democratic Republic) on the east.

Source: Wikipedia — Moroccan Western Sahara Wall (CC BY-SA 4.0)