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countable and uncountable, plural high waters
(uncountable) The location of high tide on a coastal area. quotations examples
So as not to impede navigation the two principal spans of the bridge were designed to provide a clear headway of 157 ft. above high water for a distance of 500 ft.; [...].
1941 January, the late John Phillimore, “The Forth Bridge 1890-1940”, in Railway Magazine, page 5
The state of the tide when the water is at its highest. examples
(countable) The highest stage of a river. examples