I found this spectacular view of irrigated farms in Libya from deputydog
"Center pivot irrigation is basically a method of agricultural irrigation which results in a circular field of crops. a huge column of sprinklers, fixed to the ground at one end, slowly travels around in a circle whilst spraying the crops below. you can see the sprinkler arms, some of which can reach a kilometre in length".
The hexagonal forms look like they are made up of clusters of houses in the middle and farmland radiating out.
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