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Sand Ridge State Forest is a conservation area located in the U.S. state of Illinois. Containing 7,200 acres (2,900 ha), it is the largest state forest in Illinois. It is located in northern Mason County. The nearest town is Manito, Illinois, and the nearest numbered highway is U.S. Highway 136. It is located on a low bluff, or "sand ridge", overlooking the Illinois River, hence the name.