Trollshaws
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The Trollshaws in J. R. R. Tolkien's fictional Middle-earth are the upland woods, consisting at least partly of beech trees, that lay to the west of Rivendell between the Rivers Hoarwell and Loudwater. They were the haunt of trolls. Three of these trolls waylaid Bilbo and his companions during the Quest of Erebor. Years later Frodo and his companions found them on their way to Rivendell, but they were inert stone.
There is a bit of a contradiction regarding the layout of the Trollshaws. In The Hobbit, the company passes over a "stone bridge" and very soon after that spots the troll's fire. The fire could not have been more than an hour or two away. In the Fellowship of the Ring, however, Aragorn explicitly leads the Hobbits over the Last Bridge and takes six days to reach the site of the troll camp. It's hard to imagine Aragorn, being such a skilled ranger, would take six days reaching a spot the dwarves stumbled across in an hour (especially considering he was pressed for time). The only likely explanation is that the Last Bridge was not in fact the "last bridge" and that a second stone bridge crossed an unknown river in the Trollshaws.