During the process of land acquisition for the namesake lake during the 1920s, 17,500 acres (71 km) of land along the Grand Glaize Arm of the lake was set aside for a national park. In 1946, this land was acquired by the State of Missouri for Lake of the Ozarks State Park, the largest park in the Missouri State Parks system. Another state park on the shores of the lake is Ha Ha Tonka State Park on the Niangua Arm of the lake.