text: It seems to me that the original note is saying that this beach/badeplass is named "Plage". I can not find a source for that, but according to this map the name is actually "Hvervodden". Though that, of course, sounds more like the name of the whole "odde", not just the beach. https://www.oslofjorden.com/badesteder/kart_badeplasser_oslo_kommune.html
  
  If there's no more information to be had here soon I'll name the beach Hvervodden and close this note. It's been 7 years, after all.