Buzzwords
Wikipedia: An estuary is a partly enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea
Elsewhere on the Web
Estuary Facts – NOAA
Soundsurvey.org.uk
http://www.soundsurvey.org.uk/index.php/tidal-thames/rachel-lichtenstein
New Zealand
https://www.doc.govt.nz/nature/habitats/estuaries/our-estuaries
https://twitter.com/docgovtnz/status/1063242601870974976
Wikipedia
Estuary
Examples
Chesapeake Bay
Planeta.com