I didn't know about the practice of mapping the coastline along the baseline, AFAIK we don't map the baseline, only their 12nm offset (maritime borders)
Vice versa, the practice is mapping the baseline along the coastline. But I think this is no a good idea, because baseline extend up a bit outside of the coastline, if the baseline runs along the low tide. In some places the tidal range is huge.
The example of Rio de la Plata exposed previously is clearly poorly mapped according the definition of natural=coastline. Note that according IHO Rio de la Plata is a sea.
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