bay, freshwater moving down. violent wind; tropical storm, hurricane. all keep the chesapeake shoreline in tenuous ebb and flow. holland island, nesting home for hundreds of brown pelicans, was once a thriving community... hundreds of residents, a general store, school, church, and a fleet of schooners and skipjacks. but the chesapeake encroaches, almost at will. decades of erosion from wind and tide, and the ravages of hurricane isabel in 2003, the island slips into memory. sharps island lighthouse stands near the entrance to the choptank river, warning seafarers of the shoals off poplar island. the towering, cast iron, concrete-filled hulk, proved no match for the mighty force of winter ice that thrust sharps island lighthouse into a precarious 20-degree list. prime real estate high atop the cliffs at calvert county comes with spectacular views. but these edges, where land and water meet, are on the move. every now and then, eroding earth tumbles down to the shore. the cliff top is receding. breakwaters and riprap slow, but cannot stop the process. the forces of nature are continually at work, shifting the shoreline, reshaping islands, creeks, rivulets, marshes. a lon