Canyon created by 5 million years of river erosion, then flooded to make a reservoir. Concerns with drop in water level due to continued dry seasons. ISS over southwest United States. (ANSWER: Glen Canyon/Lake Mead in the southwestern United States)

iss059e035753

MIotDcTempSmugmugWinEarthFavsArizonaColorado RiverDayGlen CanyonGrand CanyonParashant National MonumentLake PowellNorth AmericaUnited StatesUtahgeo

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