Iowa Resources
Iowa is bordered by Minnesota on the north, Nebraska and South Dakota on the west, Missouri on the south, and Wisconsin and Illinois on the east. The Mississippi River forms the eastern boundary of the state. The boundary along the west is formed by the Missouri River south of Sioux City and by the Big Sioux River north of Sioux City. There are several natural lakes in the state, most notably Spirit Lake, West Okoboji Lake, and East Okoboji Lake in northwest Iowa (see Iowa Great Lakes). Man-made lakes include Lake Odessa[1], Saylorville Lake, Lake Red Rock, and Rathbun Lake. The topography of the state is gently rolling plains. Loess hills lie along the western border of the state. Some of these are several hundred feet thick. In the northeast along the Mississippi River is a section of the Driftless Zone, which in Iowa consists of low rugged hills covered with conifers—a landscape not usually associated with this state.
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