<div dir="ltr"><br><div>OpenStreetMap's definition is here: <a href="https://wiki.openstreetmap.org/wiki/Coastline">https://wiki.openstreetmap.org/wiki/Coastline</a></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">The <font face="monospace" size="1">natural=coastline</font> tag is used to mark <a href="https://en.wikipedia.org/wiki/en:mean_high_water_springs">mean high water springs</a> (also known as Mean High Water Level / MHWL) which is the point of highest tide.</blockquote><div><br></div><div>Donal</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 5 May 2021 at 16:10, Pat Brown <<a href="mailto:mistyhaven@gmail.com">mistyhaven@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Hi<div dir="auto"> What constitutes a coastline? Is it the high water mark, the low water mark, something intermediate, the claimed territorial waters or something else? I would also guess that this would differ depending on whether political or geographical.</div><div dir="auto"><br></div><div dir="auto">Thanks,</div><div dir="auto"><br></div><div dir="auto">Paddy</div></div>
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