fe.settings:getUserBoardSettings - non array given[kc] - Endchan Magrathea
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So these are part of irrigation systems, 11 all in all registered at UNESCO. Chains of wells and tunnels to channel water from below the hillsides to the settlements. They idea is some three thousand years old, and they are working and maintained today still. Some article I found said that about 40K people's water is supported by them.
https://whc.unesco.org/en/list/1506/