There are also some inward-facing fortifications, because portions of the wall were built on the assumption that raiding parties would also be trying to leave, and they knew they couldn’t block off literally the entire border.
Edit: in case you don’t buy that, look at Hadrian’s Wall. Both fortifications are actually built on a similar premise with similar principles.
Apparently it’s part of a myth pushed by Russian nationalists.
https://www.reddit.com/r/badhistory/comments/ieg2k0/tartaria_the_supposed_megaempire_of_inner_eurasia/
There are also some inward-facing fortifications, because portions of the wall were built on the assumption that raiding parties would also be trying to leave, and they knew they couldn’t block off literally the entire border.
Edit: in case you don’t buy that, look at Hadrian’s Wall. Both fortifications are actually built on a similar premise with similar principles.