Some structure in Morocco, near Western Sahara, military ??
Hi, I found these "walls". Is it something ancient? Rather large.
This appears to be part of 2nd wall of the Moroccan Wall. Only parts of it can still be easily seen because of shifting sands and because the wall kept being built further out as years went on.
You can find a map and information on Wikipedia.
As you can see on the wiki map the second wall starts west of Tindouf and northwest of Mahbas on the border of western Sahara just as your structure does.
Hm... I have a vague memory of discussing this wall on here many years ago.