Prince Edward Island National Park lies along 40 km of the Island's north shore. The landscape varies from sand dunes, beaches and red sandstone cliffs to salt marshes and fresh water ponds. The park has the finest example of the delicate 'sand dune ecosystem' in Atlantic Canada. The star residents are the fragile piping plover, which nests in sandy beaches, and the great blue heron, a common sight along the inland salt marshes and shallow ponds. Green Gables House, the home immortalized by Lucy Maud Montgomery, attracts thousands of visitors from all over the world. Dalvay-by-the-Sea was the summer home of a millionaire American businessman and was later used secretly as the headquarters for the island's legendary prohibition-era rum-running.