These polygons depict the part of the shore or beach which lies between the Mean Low Water Mark and Mean High Water Mark.
Schema
The schema of the feature type describes the "returnables" and "receivables". "Returnables" are feature properties that are returned in responses to a query. "Receivables" are feature properties are feature properties that have to or can be provided by the client in mutation operations (create, replace, or update). Unless otherwise specified, a property is both a returnable and a receivable.