The River Greta is a river in Cumbria, England. It is a tributary of the River Derwent and flows through the town of Keswick. "Greta" derives from the Old Norse "Griótá", meaning "stony stream". The name is in records dating from the early 13th century, and also appears in Latinised form, as "Gretagila", at the time of Magna Carta.

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