Mid Atlantic Coastal Information Resource Presents Assateague Island Assateague Island State Park and National Seashore Assateague Island is a barrier island built by sand that persistent waves have raised from the ocean's gently sloping floor. Constant reshaping mirrors a restless origin, as steady winds continue moving trillions of sand grains, each a bit of eroded ancient Appalachian Mountains.
Occasional storms drive waves and sands so forcefully that beach and shoreline change dramatically.
But Assateague's summer mostly means the lure of beaches and mild surf where shorebirds trace the lapping waves back down the beach. Behind the dunes, the island's forests and bayside marshes invite exploration. Now and then a wild pony wanders into view. Assateague Island National Seashore is administered to provide for recreational use and enjoyment consistent with the maintenance and perpetuation of the seashore's natural communities. Together, these agencies hold in trust a priceless seashore heritage of wildlands, wildlife, and outdoor recreation.