Anyway, both of those were dry at one point and the water of the oceans broke through. The Black sea went from low lying valley (akin to the dead sea valley, but much bigger) to open sea in less than a week.
I don't know, but that even seems to me must have been pretty spectacular (to watch from a SAFE distance).
So does the Black Sea waterfall not count because it was so temporary? Was it still somehow smaller than the one from the article? Or has its size not yet been verified?
I have a book in storage on this (helpfully titled "Glacial Lake Missoula") -- The craziest statistic that I can remember is that the calculated outflow through one of the canyon choke points was a mile wide, hundreds of feet deep, and travelled at 60mph. There are scars from passing icebergs on the walls.
More info for fellow Geo-Nerds:
Having seen both, I'm not sure that doubling and tripling Niagara would make it larger than Iguazu Falls...probably taller, but Iguazu is really, really wide.
Eastern Washington's Scablands are pretty impressive relics.
 "The area below and adjacent to the Barrier, a geological feature upholding Garibaldi Lake is considered hazardous. Although imminent danger is unlikely, special regulations are in effect to make you aware of the potential danger and to minimize the risk to life and property in the event of a landslide. Posted signs identify the Civil Defence Zone. Do not camp, stop or linger while traveling through the zone. Camping or remaining overnight at or near the Garibaldi Lake parking lot is prohibited. Developed campgrounds are located nearby at Alice Lake and Nairn Falls Provincial Parks." - http://www.env.gov.bc.ca/bcparks/explore/parkpgs/garibaldi/
I wonder what actually prevents them just showing the page without adverts to UK readers, rather than showing the placeholder; I'm supposing that its for political reasons as in, they wont show it, rather than cant
BBC Worldwide is a commercial company that is owned by the BBC (and just the BBC). No money from the licence fee was used to create this page. The profits we make from it go back to BBC programme-makers to help fund great new BBC programmes."
C'mon man, it's right there on the front page...
1. Website is run on a commercial basis.
3. Therefore it is not accessible from the UK.
Is it when the Atlantic broke through to create the Med?
It's in Washington state in the USA. The key point is that it's the largest confirmed waterfall, the creation of the Med might not have created a waterfall and instead been more of a massive surprise river.
>a wholly-owned subsidiary of the BBC
I will translate the paragraph you quoted: "We don't want to show this content to people in the UK."
That is literally exactly its meaning. (I didn't investigate if it is true but that is the meaning of the paragraph you quoted, as written.)
EDIT: this got a downvote, so reread my comment more carefully.
> The BBC may carry out commercial activities but only through subsidiary companies. There is a risk that without appropriate safeguards the BBC’s public funding could be used to subsidise or benefit these subsidiaries by offering services on favourable terms. This could distort competition by giving its commercial subsidiaries an unfair competitive advantage.