High Quality Content by WIKIPEDIA articles! A tidal waterway is one open to the sea and far enough downstream (close enough to the sea) to be subject to twice-daily (or daily, depending on the local tides) reversals of flow and variation in depth. Non-tidal waterways are either far enough upstream to be beyond tidal effects, or are separated from the sea or the tidal stretch of the same waterway by a barrier (usually a navigation lock). In actuality, every body of any liquid on the face of the Earth is subject to tides—even a bird bath. However, only bodies of water susceptible to tidal changes noticeable to humans are included in the customary definition.

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