Trempealeau Mountain State Natural Area in western Wisconsin preserves a striking 425-foot rock mound within Perrot State Park, surrounded on three sides by the Mississippi and Trempealeau rivers. One of only three solid rock islands along the entire Mississippi, it stands out for both its geology and its varied natural communities, including oak and basswood woods, maple on cooler slopes, and small prairie patches on drier southern exposures. The area also holds deep human history, with numerous Native American mounds, burial sites, and habitation sites. Its name comes from a French phrase meaning “the mountain whose foot is bathed in water.”