polyhaline

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Polyhaline is a salinity category term applied to brackish estuaries and other water bodies with a salinity between 18 and 30 parts per thousand.{{Cite encyclopedia |title=polyhaline |encyclopedia=A Dictionary of Environment and Conservation |publisher=Oxford University Press |url=https://www.oxfordreference.com/view/10.1093/acref/9780198609957.001.0001/acref-9780198609957-e-6242 |last=Park |first=Chris |date=2007 |isbn=9780191726651}} It is the most dense saltwater type that is classified as "brackish."