A collapsed cave on land is a sinkhole. Is that not appropriate? The natural=cliff idea is also sensible and correct for the edge of the hole
Natural=arch on a node is a great idea for the natural bridge between the collapsed section and the open sea. There are plenty of similar features on rocky coasts, Eg Oregon, Baja California, and in deserts due to wind erosion (eg Natural Arches monument in Utah) Small collapsed sea caves can become a “blowhole” if wave action causes water to erupt up through the hole, but it doesn’t sound like this is the case in this particular place. On Mon, Oct 8, 2018 at 7:17 AM Paul Allen <pla16...@gmail.com> wrote: > On Sun, Oct 7, 2018 at 9:52 PM ael <law_ence....@ntlworld.com> wrote: > >> >> No. I am sure that I have seen a dedicated/specialist term for exactly >> these features. Just can't recall the details ATM. > > > As I mentioned in another part of this thread, I subsequently found that > the correct term for > one of these is a littoral cave (if you want to be fancy) or a sea cave > (if you want to be plain). This > particular one is a collapsed littoral cave. Well, that's the best I > could come up with after looking > at various wikipedia pages. As for existing, documented tags, nothing > seems to be an exact > match for this. > > > -- > Paul > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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