This is a bug I've encountered 3 times already in different .952 games and I've never seen before:
Sometimes the waterfalls at the end of rivers are "floating" above the tile where they should be in instead of on it.
EDIT: here is a screenshot of the bug with my sovereign standing in the adjascent tile:
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... and here is one where my sovereign is standing ON the tile, underneath the floating waterfall...
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I also have linked to a savegame showing the problem (it's right next to Lorien, my city in the North).
Keep up the great work, Bendiwolf