Little Rockies (photo by Rick and Susie Graetz)
Indians migrating through this territory north of the Missouri River called them “the island mountains.” From a distance, they resemble atolls rising from the prairie sea of north central Montana. Although not very lofty (the highest point is 5,720-foot Antoine Butte), they reach 2,500 feet above the surrounding plains and can be seen from 75 miles away. To the people in towns like Roy and Malta, this 50-square mile mass of igneous and sedimentary rock is one of the most historic ranges in Montana.
University of Montana's Department of Geography