Correction for the size of Mackinac Island
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How big is 1,100 acres?
It's about two-fifths as big as Mackinac Island

The size of Mackinac Island is about 2,794 acres.
(Michigan)
Mackinac Island measures 2,794.80 acres in total land area. The island is located in Lake Huron and is known as a historically-cultured tourist destination and summer colony, home to the well-known Victorian Grand Hotel.