What are these? google earth find

found these one day, they look like key holes. no idea what they are! there are hundreds of them surrounding Al Hayit Saudi Arabia. 25 59'14N 40 26'57E

found these one day, they look like key holes. no idea what they are!
there are hundreds of them surrounding Al Hayit Saudi Arabia.
25 59'14N 40 26'57E

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