Correction for the size of Mackinac Island
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How big is 417 virgates?
It's about four-and-a-half times as big as Mackinac Island

The size of Mackinac Island is about 93.1340 virgates.
(Michigan)
Mackinac Island measures 93.1590 virgates 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.