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<br><div class="gmail_quote">On 3 April 2018 at 05:27, Martin Koppenhoefer <span dir="ltr"><<a href="mailto:dieterdreist@gmail.com" target="_blank">dieterdreist@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
<br>when I’m adding beaches at the sea I will usually use the coastline as border towards the water and the put the rear border where it looks like the end of the beach. On rivers and lakes I would also use the water boundary as border for the beach.<br></blockquote><div><br></div><div>Moving way from high & low tides for a moment to the actual "coastline" itself.</div><div><br></div><div>When you have rivers opening into the sea, where does the "coastline" go? </div><div><br></div><div>Should it continue more or less straight, following the line of the beach, across the mouth of the estuary; or should it follow the estuary / river bank for an undetermined distance inland?</div><div><br></div><div>Just one of any number near us <a href="https://www.openstreetmap.org/edit#map=16/-28.1294/153.4824">https://www.openstreetmap.org/edit#map=16/-28.1294/153.4824</a>, the coastline follows the estuary then river bank for ~5 km's inland (including around 2 canal estates!), then crosses the creek (which at that spot is <10 m's wide) & returns to the beach.</div><div><br></div><div>Wouldn't it make for sense for the coastline to cross from Currumbin Rock to the tip of the groyne, with the rest of the line being river bank?</div><div><br></div>Thanks<div><br></div><div>Graeme</div></div></div></div>