Popular Prevost Harbor, part of Stuart Island State Park, has dangerous reefs both inside and outside the harbor. In recent years, the reef at the western entrance struck and sunk MV Norwester, the classic yacht formerly owned by John Wayne (pictured below). More commonly hit is the reef northwest of the state park dock inside the harbor (second image below). There is also a reef that extends off the western tip of Satellite Island, and another just southeast of that. Prevost Harbor reefs have long been on the Friends of the San Juans "16 Most Frequently Hit Rocks or Reefs in the San Juans" list (click on map below to pinch/zoom). Boaters should exercise caution and keep proper charts on hand when in the area. The rock and reef strewn eastern entrance is not recommended for transiting without detailed local knowledge.