p. 352

372 Dane Co.

of moderate elevation and have gentle slopes to their summits. The valley occupied by the Four Lakes and their Outlet is the principal ones and occupies the central portions of the county. There are no considerable portions that can be called timbered land, it being almost entirely oak openings or prairie. Some of the eastern portions of the county are occupies by dry ridges separated by wet meadows, and afford but little inducement for present settlement. The west line of the county passes between the two Blue Mounds, the largest or principal one falling within the county of Dane. About three townships, occupying the south west corner of the county are within the country known as the "Mineral Region" and lead mines have long been worked at the Blue Mounds. It touches upon Lake Koshkonong an expansion of Rock river on the south east, and upon the Wisconsin river at the north west; embracing