This includes coastal sand hills (beyond the strand line or upper tide line - usually where there is some established vegetation), interdune slacks and related salt marshes, and coastally exposed banks, shingle ridges, terraces and cliffs. All receive or are exposed to salt in the air or water. It is bounded below the strand line by the Beachcombing Project (or Mariners project where cliffs drop straight into the sea or to rockpools) which includes biological jetsam that has blown in or been carried up by the sea. Dunes cover a broad range from foredunes of mobile sand with specialised sand binding plants, to back dunes stabilised with shrubs and coastal bush, through to inland old stranded dunes which may have well-developed forest. Use tags to specify which kind of coastal community. less ↑