Forest River.

From the West of Ered Mithrin ran the Forest River into the North-West corner of Mirkwood following a South-Eastern course but turned ever more Eastern until it 200 Miles further down its course some 15 -20 Miles from the Caverns of Thranduil headed nearly East. There came the tributary, the Enchanted River from Emyn Duir 60 Miles further South. The Forest River continued East passing Thranduil`s realm out of the forest into the Long Marshes before it flowed into the Long Lake 65 Miles from the junction with the Enchanted River. A course about 265 Miles long.