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Unique land features at Apostle Islands National Lakeshore include rocky cliff faces, clay banks, sandscapes, and bogs. Clay banks contain a high percentage of sand which is eroded rapidly and transported by long shore currents to form a variety of coastal sand features or sandscapes. Sandscapes include several unique landforms such as barrier beaches (Julian Bay on Stockton Island) and spits (Long Island); cuspate forelands, which are triangular- shaped seaward extentions (Raspberry and South Twin islands); tombolos, which are sand or gravel bars stretching from an island to the mainland or another island; a double tombolo (Stockton Island); and sand spits (Cat and Outer islands). These various landforms are located primarily on the southern sides of the islands. Sandscapes typically comprise a beach that is devoid of vegetation, active dunes vegetated with beach grass (Ammophila breviligulata), interdunal hollows, stabilized dunes and/or beach ridges, and frequently a former lake basin covered with bog or alder thicket community type vegetation.