This same edit reaffirmed that the coastline would be mapped at the high water mark. It says no beach can intrude on a body of water, but the tidal area can be either a natural=wetland wetland=mudflat or natural=sand.
This is somewhat counterintuitive to me. All up and down the California coast, you can find beaches that are popular attractions at low tide and completely submerged at high tide. At high tide, there is no space between the water line and the coastal cliff. Yet no one here would deny the existence of beaches along the coast and describe them as mere deposits of sand.
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