wrack line
**Definition:** The line of debris deposited at the highest reach of the tide or storm surge on a beach — seaweed, driftwood, shells, crab shells, feathers, plastic, rope, and whatever else the sea was carrying. The wrack line is the ocean's high-water mark, redrawn with every tide, and it is one of the most ecologically productive zones on a beach: the decaying organic matter feeds sand hoppers, flies, shorebirds, and the entire web of life at the land-sea boundary.
The line of debris deposited at the highest reach of the tide or storm surge on a beach — seaweed, driftwood, shells, crab shells, feathers, plastic, rope, and whatever else the sea was carrying. The wrack line is the ocean's high-water mark, redrawn with every tide, and it is one of the most ecologically productive zones on a beach: the decaying organic matter feeds sand hoppers, flies, shorebirds, and the entire web of life at the land-sea boundary.
Etymology
Middle English wrak, wreckage, from Old Norse or Middle Dutch. The wrack is what the sea wrecks upon the shore.
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