Rule 12.
An area of Lake Michigan bottomlands including the water surface described as: beginning at the point where the northernmost portion of Cathead Point, Leelanau County intersects the Ordinary High Water Mark (OHWM) of Lake Michigan (approximately 45Chr(176)11'15"N, -85Chr(176)37'04"W), thence northeasterly to a point in Lake Michigan lying at 45Chr(176)13'54N, -85Chr(176)33'14"W (north of Lighthouse Point, Leelanau County) thence proceeding easterly along latitude line 45Chr(176)13'54"N until it intersects the OHWM in Charlevoix County (approximately 45Chr(176)13'54"N, -85Chr(176)23'19"W, north of Norwood), thence along the OHWM of Grand Traverse Bay generally southerly, westerly, and northerly, to the point of beginning, including all of the West and East arm of Grand Traverse Bay, excluding all islands above the ordinary high waterline of Lake Michigan and previously conveyed areas, containing 295 square miles, more or less.
Mich. Admin. Code R. 299.6012