Grand Gulf State Park

Grand Gulf State Park near Thayer, Missouri, consists of 322 acres (130 ha) encompassing a forked canyon that is the remnant of an ancient collapsed dolomite cave system. An uncollapsed part of the original cavern roof spans 200 feet (61 m), creating the largest natural bridge in Missouri. It was declared a National Natural Landmark in June 1971 for its excellent example of karst topography and underground stream piracy.

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