River Greta, Cumbria
…Latinised form, as "Gretagila", at the time of Magna Carta. The source of the river is near Threlkeld, at the confluence of the River Glenderamackin and St. John's Beck. From there, the river runs westward, roughly aligned with the former Cockermouth, Keswick and Penrith Railway between Keswick and Penrith. The river…