the.com/tidal marsh

A swamp with a schedule, flooding twice a day like clockwork rent.

means A low-lying coastal wetland that floods and drains with the rhythm of the tides, home to grasses, mud, and salt-tolerant life.

from Straightforward English compounding: 'tidal' traces back to 'tide,' an Old English word (tīd) that originally just meant 'time' or 'a portion of time' — the sense of 'rise and fall of the sea' only attached later, since tides were one of the most reliable ways people marked time's passing. 'Marsh' comes from Old English 'mersc,' related to 'mere' (a lake or pool), describing soft, waterlogged ground. Put together, the phrase is a 19th-century-style plain-spoken label, naming the place exactly for what it does: a marsh ruled by time itself.

nursery role
Two-thirds of commercial fish species start life here
carbon storage
Stores carbon faster per acre than rainforests
zonation
Plant species line up by flood tolerance like strict seating charts
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