[key], city, seat of Alpena co., N Mich., on Thunder Bay, an arm of Lake Huron; inc. 1871.
Limestone quarried nearby is used to make cement, Alpena's chief manufacture. Cement and
limestone are transported on the Great Lakes by way of Alpena's harbor. The city lies in a
year-round resort area and has an annual winter carnival. The Great Lakes Maritime Heritage
Center is there, and a marine sanctury encompassing Thunder Bay and nearby waters preserves
more than a hundred shipwrecks.
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