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After Gollum appeared Aragorn decided that they would have to go faster and they paddled instead of floating with the current. Also they took to travelling by night.
By the eigth night the banks were getting higher and rockier, but Aragorn miscalculated and thought that they still had many miles to go before they reached the Rapids of Sarn Gebir. Around midnight, however, they realised that they were entering them. (The Great River; Bk 1).