Mich. Comp. Laws § 123.582: Great lakes submerged lands; consent, amendment of charter.

Sec. 2.

If the written consent of the owner or owners of such lands to the annexation shall be first procured by the city or village, said annexation shall be accomplished by amending the charter of said city or village to extend the boundaries of said city or village to include said submerged lands sought to be annexed.