Classification of a hazardous feature that may pose a risk or impediment to passage. PotentialHazardValue The route passes through an area of boulders Boulders The route passes over an area of cliffs. Cliff The route passes through an active or disused excavation e.g. pit or quarry. Quarry Or Pit The route passes through as area that is covered by the tide at high tide. * Foreshore is added to all links that are intertidal. Foreshore Foreshore The route passes through an area of marsh. Marsh The route passes through an area of mud. Mud The route passes through an area of sand. Sand The route passes through an area of scree. Scree The route passes through an area of shingle. Shingle The route passes through an area of deposited material. Spoil The route passes over an area of surface rock. Rock The route passes through an area of permanent tidal water. Tidal Water The route passes through an area of permanent inland water. Inland Water