Great Wall loop between Lengkou and baiyangyu

[Kim]

Originally Posted by andarchen

Marvelous ! No doubt , your answer on multiple walls was absolute right ! . the multwalls at pass were built by recent farmers to prevent water . I posted same puzzle in Chinese GW forum yesterday， let us see whether they get same solution or not . Their web server was being out of service since last night ,that is reason why linked photos are invisible either.Thanks Bryan to post them for me too .

To me it looks like the walls are too close to the main wall to be any defensive structure, so my guess is farmwork.