The Ozarks are a physiographic and geologic highland region of the central United States. It covers much of the southern half of Missouri and an extensive portion of northwestern and north central Arkansas. The region also extends westward into northeastern Oklahoma and extreme southeastern Kansas. The hellbender, North America’s largest amphibian, was named one of the 10 U.S. species most threatened by freshwater pollution in a report released today by the Endangered Species Coalition. The report, Water Woes: How Dams, Diversions, Dirty Water and Drought Put America’s Wildlife at Risk, highlights how reductions in water quality and quantity threaten imperiled species in 10 important ecosystems across the country. The Ozark hellbender, which can grow longer than two feet, is found in streams in northern Arkansas and southern Missouri. The eastern hellbender ranges from Mississippi to New York. Both have declined in recent years and remain threatened with extinction due to water pollution and dams.