ナショナルジオグラフィックのインスタグラム(natgeo) - 5月5日 08時02分

Photograph by George Steinmetz @geosteinmetz / @thephotosociety
Center-pivot irrigation circles growing alfalfa reach to the horizon near Wadi Dawasir at the edge of the Empty Quarter in Saudi Arabia. A hundred meters beneath the sand is an ancient aquifer with fossil water that fell as rain thousands of years ago. The rotating irrigation pipe sprays water and fertilizer onto barren land to make it bloom. After twenty years of irrigation the water drops to levels so deep that it is not economic and the fields are abandoned. This is one of the hottest places on earth, and crops are only viable here for four months a year, but fields need to be irrigated year-round to stop salt from building up on the surface.

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