Rias

"A ria is a coastal inlet formed by the partial submergence of an unglaciated river valley .... that remains open to the sea." Rias may thus be fed by rivers which are insignificant in relation to the estuary's size and length. See http://en.wikipedia.org/wiki/Ria/

Ecology

Connected Sites

Site Rationale Link
Cornwall and West Devon Mining Landscape "The Tamar river is a classic example of a Ria, flooded after the last ice age". Morwellham Quay remains tidal despite being many miles inland
Getbol, Korean Tidal Flat One of the geomorphological settings are "[r]ocky islands and island-type tidal flats on a ria coast, rocky islands with high geomorphological relief and ample supply of terrigenous sediments." (Nomination text, p. 163)
Kotor Includes part of the Bay of Kotor. Often called (wrongly) a "fjord" the Bay was never glaciated and is thus strictly a "Ria"
Vizcaya Bridge crosses the Ria de Bilbao

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  5. Be explained, with reference to a source