hightidemark ( synonym found)
Definition of hightidemark:

°a line (of seaweed or differently coloured sand etc) on the shore showing the level of high or low tide.
°(by extension) any mark showing the limit of some past activity.
Definition of hightidemark:

°a line (of seaweed or differently coloured sand etc) on the shore showing the level of high or low tide.
°(by extension) any mark showing the limit of some past activity.
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