[Tagging] Tagging estuaries: estuary=yes or river=estuary?

[Iago Casabiell]

This is a very complicated subject, made even more compliclated because the
coastline is only mapped in high tide. Intertidal zones are huge. There's a
proposed tag to map the low tide coast: natural=mean_low_water_springs.
(
https://wiki.openstreetmap.org/wiki/Proposed_features/Tag:natural%3Dmean_low_water_springs
)

I think a key for a generic term for a river mouth is needed, extending
beyond natural=coastline, wich should reach upriver to where the high tide
crawls.
Also there should be a specific tag for each type of river mouth: estuary,
fjord, ría, delta, etc.

I live in Galicia in NW Spain where the tidal range is above 4m and tiny
rivers open into huge well defined bays called rías. I've been mapping them
as bays in these last few months and there is still much work to do
extending natural=coastline upriver, drawing natural=mean_low_water_springs
and defining each type of natural=wetland contained in the ría. Check it
out and you'll see it's complicated, and also see why this new tagging is
very important.
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