Bathtub Rocks the name given to this unique formation of rock where the road runs thru the creek just south of the Nickel Preserve. The The J. T. Nickel Family Nature and Wildlife Preserve is the largest privately protected conservation area in the Ozarks. The preserve was formed in 2000 as the result of a land gift from the John Nickel Family. This 15,000-acre landscape rests in eastern Oklahoma's rolling Cookson Hills and overlooks the Illinois River. Spring-fed creeks meander amid a rugged topography of steep slopes and narrow valleys harboring a mosaic of oak-hickory forest, lofty pine woodland, and a diverse mix of savanna, shrubland, and prairie. The preserve provides optimal habitat for a suite of uncommon breeding bird species, including some whose survival requires large blocks of intact habitat.