Re my reply 8, above
MV American Mariner
Nautical Charts for Munuscong Lake and Mud Lake.
https://www.nauticalchartsonline.com/chart/zoom?chart=14883
https://www.nauticalchartsonline.com/chart/zoom?chart=14882
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Portion of St. Marys River remains closed after big freighter hits buoy, no pollution reported - March 28, 2024:
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Munuscong Lake
https://outdoormichigan.org/feature/10699
Mud Lake is the body to the south. The junction between the two lakes, is the site of the narrow channel and where MV American Mariner stopped.