Isle Royale National Park is defined by its series of parallel ridges and narrow bays, a wilderness landscape where terrestrial trails and maritime landmarks meet. The high interior is marked by Ishpeming Point and the Greenstone Ridge which runs the length of the island, followed by Red Oak Ridge and Houghton Ridge toward the south. These uplifted formations create a rugged topography for the Greenstone Ridge Trail and Minong Ridge Trail, while providing protection for inland water bodies like Lake Desor and Mud Lake. Along the southern shoreline, the land terminates at Point Houghton, where the Houghton Point Passage separates the main island from Brandsford Reef. Small maritime havens such as Fishermans Home Cove and Little Boat Harbor highlight the island's history of coastal refuge, while larger inlets like Siskiwit Bay and Hay Bay cut deep into the shoreline near Finn Point.
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1958 · Hancock
USGS Topo · 1:250,000
1959 · Fort William
USGS Topo · 1:250,000
1960 · Hancock
USGS Topo · 1:250,000
1961 · Hancock
USGS Topo · 1:250,000
1966 · Hancock
USGS Topo · 1:250,000
1968 · Fort William
USGS Topo · 1:250,000
1985 · Todd Harbor
USGS Topo · 1:100,000
1985 · Pigeon Point
USGS Topo · 1:100,000
1985 · Siskiwit Bay
USGS Topo · 1:100,000
1985 · Grand Portage
USGS Topo · 1:100,000