The lands typically rises to a height of 100 f to 300 f above the surrounding farmland throughout the duration of its range , occasionally reaching higher than 350 f. The land , while not exhibiting many characteristics of mountains , nevertheless rises typically to a height of 100 f to 300 f above the surrounding farmland through the duration of its range , occasionally reaching higher than 350 f. The name of this range of hills is translated from the Ojibwe Gaaskibag-wajiwan , which was interpreted by Gilfillan as â Rustling Leaf Mountains .