Located near the confluence of the Mississippi and Apple rivers, this 2,500-acre park, named for the line of lofty, steep cliffs along the river, is rich in American Indian history. Many caves are evident as well as dangerous sink holes-limestone caves, and intriguing rock formations, including Indian Head, with its aquiline characteristics, and Twin Sisters, a pair of humanoid figures on the bluff tops. The park features a 15-mile trail system, campground, fishing, boat launches, picnic areas with playgrounds and toilets, three shelters available to groups of 25 or more, and a concession area open from May 1 to September 15, and holidays. In the winter the park offers cross-country skiing, sledding, and conditions permitting, ice fishing at the boat launch area.