Africa is experimenting with something fairly reminiscent to this. Not sure about the content, but this one has the best pictures: https://www.upworthy.com/fo

Africa is experimenting with something fairly reminiscent to this. Not sure about the content, but this one has the best pictures: https://www.upworthy.com/forgotten-half-moon-water-harvesting-method-transforms-barren-wasteland-into-green-farms-ex1/ https://www.upworthy.com/forgotten-half-moon-water-harvestin... I'm just not sure if the relationship between the holes, the ridgeline, and prevailing winds (rain) line up for this being a water harvesting solution. But it's clear that in several sections they've done this on all of the terrain that's walkable on some of those hills, and I know walking ridgetops is often a solution to get through rocky or desert areas.