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180,533,300 dunams is about nine-tenths as big as South Dakota.
In other words, it's 0.90388310 times the size of South Dakota, and the size of South Dakota is 1.1063380 times that amount.
(United States)
The "Mount Rushmore State," South Dakota measures 199,730,800 dunams in total area. The Black Hills mountain range area, contained within South Dakota and Wyoming, measures about 15,500,000 dunams.
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