Stonewain Valley was a long straight valley in the eastern White Mountains. It was made in ancient days by the Men of Gondor, as a route from the quarries beneath Min-Rimmon to Minas Anor. By the time of the War of the Ring, it was all but forgotten, but it was rediscovered in time to be used by the Rohirrim to come to the Battle of the Pelennor Fields.
The name was given because of the "wains (sleds or drays) passed to and fro from the stone-quarries" along the long, narrow defile. In Quenya it was called Nand' Ondolunkava or Ondolunkanan(do), in Sindarin Nan Gondresgion and in Rohirric Stānwægna Dæl.
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