It is a 1,818-acre nature area managed by the Kansas Department of Wildlife and Parks. It features the dramatic Big Basin, a mile-wide, 100-foot-deep sinkhole formed thousands of years ago by dissolving gypsum and salt formations, creating a unique landscape. Adjacent is the smaller Little Basin, home to St. Jacob's Well--an 84-foot-wide, 58-foot-deep water-filled sinkhole used historically as a landmark and watering site for prehistoric peoples, Native American tribes like the Northern Cheyenne, and 19th-century cattle drives from Texas. The preserve protects native mixed-grass prairie, bison herds, and diverse wildlife in the Red Hills region. Designated a National Natural Landmark in 1978, it's open year-round for hiking, wildlife viewing, and scenic drives along US-283, which bisects the basin. No entrance fee; primitive camping available with permits. read more

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