South Manitou Island Marina occupies a sheltered harbor on South Manitou Island in northern Lake Michigan, just off Michigan’s Leelanau Peninsula. The site lies within the Manitou Passage, a stretch of open water bounded by the mainland and the Manitou Islands that forms part of Sleeping Bear Dunes National Lakeshore. It accommodates recreational boaters traveling Lake Michigan for cruising, fishing, and access to the island’s trails and shoreline.
Marinas typically need to separate slip holder parking from day-visitor parking, trailer areas, launch ramps, and secure dock access points. Modern facilities use barrier gate systems to enforce these zones automatically — allowing permitted vehicles through via transponder or keycard while logging all access events.