Grays Reef Passage serves as the primary route between the Straits and the ports on the southern shores of Lake Michigan…Bounded on the east by Vienna Shoal and East Shoal, Grays Reef itself forms the western boundary of the passage, and consists of an extensive area of shallow water over a rocky bottom stretching over eight miles in length...With some portions of its rocky bottom almost protruding above the water’s surface, the reef has long represented a significant threat to any vessel master unfamiliar with the intricacies of the passage.
미시간호의 역사가 기린 등대...
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