The Keweenaw Peninsula is the northernmost part of the peninsula (not counting Isle Royale, which is politically part of the UP). It projects into Lake Superior and was the site of the first copper boom in the United States, part of a larger region of the peninsula called the Copper Country. Copper Island is its northernmost section. Its lowest elevation is along the shoreline of Lake Huron and Lake Michigan, averaging above sea level. Its highest elevation is Mount Arvon, at .