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Figure 7.19 shows what one of these walls looks like from the Polisario side. The berms are about three meters high, built along the hills and ridges, and fortified with fences and landmines.

Figure 7.19 Wall South of Mahebs (Olaf2, 2006 FlickreviewR, 2007 Llorenzi, 2013. CC BY-SA 2.0).
Source: Olaf2, 2006 FlickreviewR, 2007 Llorenzi, 2013, https://commons.wikimedia.org/wiki/File:Mahbes.jpeg
This work is licensed under a Creative Commons Attribution-ShareAlike 2.0 License.