That's as far as riverboats and barges can go. A barge can draw up to 5' and requires a decently rock-free channel. Smaller craft (which can't compete econmically further downstream) could probably travel much higher. York Boats, canoes, skiffs and the like. Surely, there are fishing boats further up.
I wonder if Furthest is the equivalent of the 'First Cataract' on the Nile or the rapids at the Loreli on the Rhine (impassible till the 18th century)?
Sorry, just thinking of boats and messing about in them. Jeff
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