Tidelands are the territory between the tide line of sea coasts and lands lying under the sea beyond the low-water limit of the tide, considered within the territorial waters of a nation. In the United States, the upper limit of tidelands is determined by the mean high tide as established by a chart datum, defined as a 19-year period based on the lunar cycle known as the National Tidal Datum Epoch.
Tidelands are the territory between the tide line of sea coasts and lands lying under the sea beyond the low-water limit of the tide, considered within the territorial waters of a nation. In the United States, the upper limit of tidelands is determined by the mean high tide as established by a chart datum, defined as a 19-year period based on the lunar cycle known as the National Tidal Datum Epoch.
Source: Wikipedia "Tidelands" · CC BY-SA 4.0
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