Long Lake (Middle-earth)
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In J. R. R. Tolkien's fictional world of Middle-earth, the Long Lake is a lake situated at the confluence of the Forest River and the northern reaches of the Celduin south of the Lonely Mountain. The lake gets its name from being longer north/south than it was wide east/west (standing on the west shore where the Forrest River emptied into the lake the east could barely be seen, but the north and south could not). The lake emptied out over waterfalls on the southern edge into the River Running that led all the way to the great Sea of Rhûn.
The town of Esgaroth was built entirely upon the lake itself, which thus fomed a natural moat. It was built very near to the Forrest River outlet, but protected from the stream by a promontory of rock. The water in the Lake itself was calm.