I would also reuse the existing nodes and tag as natural= water just make sure the join between the 'lake' and the coastline share two nodes. In Aus we call them Canals but they obviously not the same as a canal in the UK though I have seen them tagged waterway=canal also. I prefer to have the coastline at the edge of the sea, ie across a river mouth, though I see there is discussion about having all the tidal part as coastline, but I don't no how you work that out from a quick survey or Bing. Peter W
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