island but is now a peninsula due to tropical storms and hurricanes that closed inlets that separated it from the Currituck Banks), Pea Island (which has, at times, been contiguous with neighboring Bodie Island or Hatteras Island), Hatteras Island, Ocracoke Island, Portsmouth Island, and the Core Banks. Over time, the exact number of islands and inlets changes as new inlets are opened up, often during a breach created during violent storms, and older inlets close, usually due to gradually shifting sands during the dynamic processes of beach evolution. The Outer Banks stretch southward from Sandbridge in Virginia Beach down the North Carolina coastline. Sources differ regarding the southern terminus of the Outer Banks. The most extensive definition includes the state's three prominent capes: Cape Hatteras, Cape Lookout, and Cape Fear. Other sources limit the definition to two capes (Cape Hatteras and Cape Lookout) and coastal areas in four counties (Currituck County, Dare County, Hyde County, and Carteret County). Some authors exclude Carteret's Bogue Banks; others exclude the county entirely. The northern part of the Outer Banks, from Oregon Inlet northward, is actually a part of the North American mainland, since the northern inlets of Bodie Island and Currituck Banks no longer exist. It is separated by the Currituck Sound and the Intracoastal Waterway, which passes through the Great Dismal Swamp occupying much of the mainland west of the Outer Banks. Road access to the northern Outer Banks is cut off between Sandbridge and Corolla, North Carolina, with communities such as Carova Beach accessible only by four-wheel drive vehicles. North Carolina State Highway 12 links most of the popular Outer Banks communities in this section of the coast. The easternmost point is Rodanthe Pier in Rodanthe, NC . The Outer Banks are not anchored to offshore coral reefs like some other barrier islands, and as a consequence, they often suffer significant beach erosion during major storms. In fact, their location jutting out into the Atlantic makes them the most hurricane-prone area north of Florida, for both landfalling storms and brushing storms offshore. Hatteras Island was cut in half on September 18, 2003, when Hurricane Isabel washed a 2,000 feet (600 m) wide and 15 feet (5 m) deep channel called Isabel Inlet through the community of Hatteras Village on the southern end of the island. The tear was subsequently repaired and restored by sand dredging by the U.S. Army Corps of