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I'm looking for something like google maps of waterways that can show you what rivers, canals, etc.. are boatable, from origin to destination. Is there anything like that?
I doubt you will find one that covers the entire earth.
So..... which little corner of the world are you interested in?
Don't know if you will find exactly what you are looking for. Most rivers are navigable, but there may be a dam smack dab in the middle of it that prevents your passing.
Hopefully someone will pop in and satisfy your curiosity.