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US Longest Rivers
DirectionsName the 100 longest rivers in the US. Markers are at the source of the river. Part of the river may not be in the US, but the entire length is still counted.
Quiz Takers 
Where is the Wabash River?
missed it and one other – both added (sources differ for this quiz)
the world version has markers at the mouths, while this has markers at the source
that’s true 🙂
shouldn’t it be consistent
I think the source is better as two rivers may share a mouth (e.g. the source of Missouri is officially defined as the confluence of the Jefferson and Madison rivers, which means the Jefferson and Madison have the same mouth).
It’s also true outside of America – the Blue and White Nile, or the Biya and Katun which form the Ob, for instance