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Originally Posted by Galadriel55
Tharbad could be a possibility because it's the only ford in the area and controls pasage across the river, not because it's on the edge).
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Tharbad was also the navigable head of the Greyflood (Gwathlo in Sindarin, earlier Gwathir "shadowy river from the fens"). The river was broad and deep enough that ships could be sailed or rowed that far inland. Beyond that were the fens. Heads of navigation on rivers are another cause for large towns to grow up - of which Tharbad was one.