On Sun, Oct 7, 2018 at 6:26 PM Mateusz Konieczny <matkoni...@tutanota.com> wrote:
> I would tag it as a waterway in tunnel (though I have no idea about a > suitable value) > For me, a tunnel is man-made, not natural. The tunnel=* I see in the wiki seem (at quick glance) to all be man-made. or as water area with covered=yes and natural=bare_rock area mapped, both > with a proper tags. > Better, although natural=arch seems like a better fit, even if it's undocumented. But that still doesn't deal with the water under the arch and in the basin. It also sounds like it is a tourism=attraction . > A very minor attraction. I was intending to add that but it didn't seem to pose any problems so I didn't mention it. Sounds a bit similar to https://en.wikipedia.org/wiki/Blue_Hole_(Red_Sea) - > though > this one is entirely underwater and of a different origin. > Not a good match. But it led me into a twist maze of Wikipedia pages and eventually I found https://en.wikipedia.org/wiki/Sea_cave So now I know that technically it is a collapsed littoral cave or collapsed sea cave. There's one in Oregon called Devil's Punchbowl which has been turned into a proper tourist attraction: https://www.openstreetmap.org/#map=19/44.74739/-124.06529 Whoever mapped that didn't deal with the water aspect in any way but did add something I hadn't thought of: the cliff edge around it. Without the water it just looks like a hilly area with a depression. -- Paul
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