OpenStreetMap's definition is here:
https://wiki.openstreetmap.org/wiki/Coastline

The natural=coastline tag is used to mark mean high water springs
> <https://en.wikipedia.org/wiki/en:mean_high_water_springs> (also known as
> Mean High Water Level / MHWL) which is the point of highest tide.


Donal

On Wed, 5 May 2021 at 16:10, Pat Brown <[email protected]> wrote:

> Hi
>     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.
>
> Thanks,
>
> Paddy
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