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From A Wiki of Ice and Fire
The Milkwater river by Cris Urdiales ©
The Milkwater is a river beyond the Wall. Its headwaters begin in a lake at the foot of a glacier in the Frostfangs. It has stony banks and its water is a milky white. It flows south past the Fist of the First Men through the haunted forest, possibly through the Gorge to the Bay of Ice.
References and Notes