How significantly would the course of rivers change over 10,000 years?

This one is rather straightforward. A character falls into a magically-induced coma for about 10,000 years and then wakes up to find the world around him different in quite a few ways. There's not a dramatic technological difference between the past and present, though there have been some slight advancements here and there. Question is (assuming relatively accurate mapmaking before and after his coma), do the maps look significantly different? Obviously, forests may grow or recede, but my main interest is in the bodies of water. Would rivers have enough time to significantly change course or widen/deepen?

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How significantly would the course of rivers change over 10,000 years?

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