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Introduction now says "Rainbow Bridge is often described as the world's largest natural bridge; while this title may be deserved it is a little misleading, as the technical differences between a natural bridge and a natural arch are minor and subject to interpretation."
Actually, I think there's a clearcut distinction: if there's a watercourse under it, it's a natural bridge: http://www.naturalarches.org/archinfo/faq.htm
And the Dictionary of Geological Terms defines a natural bridge as a "natural arch that spans a valley of erosion.
I'm ok with it. I haven't been there (yet - my wife really wants to go sometime) but looking at the photo on the page, it looks like it straddles a wash - so that would make it a bridge, right? — Zaui (talk) 17:29, 12 January 2007 (UTC)
Notes
American Geological Institute,
Dictionary of Geological Terms, 1976, Doubleday Anchor