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Marias River State Park is a 5,845 acres (2,365 ha) property in Toole County, Montana, United States, established May 1, 2009. The site includes an undeveloped 14 miles (23 km) stretch of the Marias River, as well as sagebrush grassland and short grass prairie habitats in the uplands, consisting of a combination of Montana state park, and wildlife management area. One of the largest undeveloped stretches of river in the area, the Marias River is undisturbed by power lines, structures, or visibly irrigated land.