navigable waters
noun plural
nav·i·ga·ble wa·ters
ˈna-vi-gə-bəl-
: waters that are capable of being navigated (as for commerce) and to which federal admiralty jurisdiction and specific environmental regulations apply
it is the national goal that the discharge of pollutants into the navigable waters be eliminated by 1985—U.S. Code
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Merriam-Webster unabridged
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