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Or raft-elves from Mirkwood travelled to Esgaroth (often with empty barrels floating on the river) and purchased the full barrels of wine there, then returning to their homes in Mirkwood on their rafts with the barrels. Full barrels of wine historically travelled on boats or rafts and I don’t see why Tolkien should have imagined anything different in Middle-earth.
There is no tide involved. Rivers and lakes are not large enough to have appreciable tides.
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