<div dir="ltr">I don't think it does to be too fussy about what is 'river' and what is 'sea' and what is 'estuary'.<br><br>Near where I live, a hydrologist would classify the Hudson River as 'estuary' as far as <a href="http://www.openstreetmap.org/way/90929525">http://www.openstreetmap.org/way/90929525</a> because it has a measurable tide right up to that point. Nevertheless, it's fresh water (the salt front is at least 100 km downstream even in a dry summer), The actual meeting of river (which, by then, is indeed salt) and ocean is another 100 km downstream from there.<br><br>The locals would be astonished if you were to claim that the bank of the Hudson River is 'seacoast', even if it has a tide and ships of considerable size can navigate the river as far as the Port of Albany. A hydrologist would say, "well, technically, that's correct" and the locals would roll their eyes.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Mar 27, 2017 at 10:05 AM, Kevin Kenny <span dir="ltr"><<a href="mailto:kevin.b.kenny@gmail.com" target="_blank">kevin.b.kenny@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>I don't think it does to be too fussy about what is 'river' and what is 'sea' and what is 'estuary'.<br></div><div><br></div><div>Near where I live, a hydrologist would classify the Hudson River as 'estuary' as far as <a href="http://www.openstreetmap.org/way/90929525" target="_blank">http://www.openstreetmap.org/<wbr>way/90929525</a> because it has a measurable tide right up to that point. Nevertheless, it's fresh water (the salt front is at least 100 km downstream even in a dry summer), The actual meeting of river (which, by then, is indeed salt) and ocean is another 100 km downstream from there.<br><br></div><div>The locals would be astonished if you were to claim that the bank of the Hudson River is 'seacoast', even if it has a tide and ships of considerable size can navigate the river as far as the Port of Albany. A hydrologist would say, "well, technically, that's correct" and the locals would roll their eyes.<br></div><div><br><br></div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Mar 27, 2017 at 9:28 AM, Christoph Hormann <span dir="ltr"><<a href="mailto:osm@imagico.de" target="_blank">osm@imagico.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span>On Monday 27 March 2017, Andrew Harvey wrote:<br>
</span><span>> > It is a bay of the Tasman Sea/Pacific Ocean. Ecologically it is a<br>
> > fully<br>
><br>
> maritime waterbody.<br>
><br>
> What do you mean by "maritime waterbody"?<br>
<br>
</span>A waterbody where plant and animal life matches or is close to that of<br>
the sea rather to that of a river or lake.<br>
<span><br>
> Botany Bay is unlike many conventional bays which are on the<br>
> coastline and part of the sea. You're right that these types of bays<br>
> are part of the sea and ocean, and other times they are part of a<br>
> river, but botany bay is really a river nor sea, if anything Botany<br>
> Bay sounds much more like an Esturary.<br>
> <a href="https://en.wikipedia.org/wiki/Estuary" rel="noreferrer" target="_blank">https://en.wikipedia.org/wiki/<wbr>Estuary</a><br>
<br>
</span>In OSM we have no separate tagging for estuaries, this would not make<br>
sense because it would just introduce yet another boundary problem<br>
(where the river turns into the esturary and where the esturary turns<br>
into the ocean). An esturary is the transit of a river into the ocean.<br>
If you consider the Botany Bay to be part of the esturary of Georges<br>
River you still have to decide where you place the coastline and if you<br>
place it below the bay you have to tag the bay waterway=riverbank or<br>
natural=water + water=river. Creating a separate waterbody that is not<br>
part of the river but within the coastline is wrong in our current<br>
tagging scheme.<br>
<br>
Note in general the esturary of Georges River would be considered to<br>
start much further upstream, likely somewhere around here:<br>
<br>
<a href="https://www.openstreetmap.org/#map=15/-33.9765/151.0237" rel="noreferrer" target="_blank">https://www.openstreetmap.org/<wbr>#map=15/-33.9765/151.0237</a><br>
<br>
at the transit from a meandering river to a ria<br>
(<a href="https://en.wikipedia.org/wiki/Ria" rel="noreferrer" target="_blank">https://en.wikipedia.org/wiki<wbr>/Ria</a>).<br>
<div class="m_-8650693734695806542HOEnZb"><div class="m_-8650693734695806542h5"><br>
--<br>
Christoph Hormann<br>
<a href="http://www.imagico.de/" rel="noreferrer" target="_blank">http://www.imagico.de/</a><br>
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