1~ Sinkhole in Guatemala. 2 ~ Diavik Mine, Canada. 3 ~ Mirny Diamond Mine , Serbia. 4~ Great Blue Hole, Belize City in the Northern Hemisphere, within Central America. 5 ~Bingham Canyon Mine near Salt Lake City, Utah, USA 6 ~ Glory Hole - Monticello Dam, California. 7 ~ Kimberley Big Hole - South Africa
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