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946 city blocks is about half as big as Rock Island.
In other words, it's 0.523560 times the size of Rock Island, and the size of Rock Island is 1.910 times that amount.
(a.k.a. Arsenal Island, a.k.a. Rock Island Arsenal) (Illinois, on the Iowa border) (land area only)
Rock Island measures 1,806.70 city blocks in total area. It is known as the largest government-owned weapons manufacturing arsenal in the United States and the US Army's only active foundry, as well as a former Union prison camp during the American Civil War.
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