This but also various mythological bits and pieces from England, because Tolkien wanted to create an English mythology akin to the Odyssey, Edda or Niebelungen.
Yeah. I absolutely love LotR. But read the niebelungen and certain poems from the Poetic Edda, not to mention Beowulf, and you see how heavy he was influenced by the stuff. Which is fine of course, everyone is influenced by things before them
There's an idea. A fantasy for American audiences using geography from South America. They'll never know unless you show them a map that includes opposite coasts.