Mount Desor is the tallest mountain within Isle Royale National Park. Located on Isle Royale in Lake Superior and with an elevation of 1,394 feet, it is the third highest peak on the lake. The 45-mile-long Greenstone Ridge Trail crosses the summit of Mount Desor as it traverses the length of the island. The summit is a 8.5-mile hike from nearest ferry landing. On an autumn day after most of the foliage has fallen, it is possible to see Lake Superior's Siskiwit Bay to the south.