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The river Gwathló or Greyflood is a river in the middle of Eriador in Middle-earth.


The Gwathló's overall length flowed through immense forests which covered Minhiriath to the north and Enedwaith to the south. It was one of the few rivers also given an Adûnaic name: Agathurush. The Gwathló was wide enough that it could be sailed on all the way to where its tributary Glanduin met the river. Its was formed where the Hoarwell met the Glanduin, where a marshy area known as Nîn-in-Eilph or Swanfleet was formed.[citation needed]


When the Númenórean Ship-kings required more and more wood to build their ships, they set up a haven-fortress on the Gwathló called Lond Daer or Lond Daer Enedh, Great (Middle) Haven and another outpost at Tharbad further up-river. From there the lands were rapidly deforested, and by the Third Age all the forests were gone.

In the late Second Age and early Third Age the Gwathló formed the border between the Kingdoms of Arnor and Gondor, and a great bridge was built at Tharbad where the North-South Road crossed the river at its only crossing in the lower stream. However by the late Third Age Gondor had retreated far south and Arnor had been destroyed. Tharbad and its bridge were abandoned and ruined after great floods in TA 2912, and the river could only be crossed at Tharbad by a dangerous ford.[citation needed]


The Sindarin name Gwathló was adapted from the name Gwathir, given to the river by the Númenóreans in the Second Age. Its name translates as Shadowy River.[citation needed]


Foreign Language Translated name
Chinese (Hong Kong) 關絲洛河
Danish Gråfloden (Gwathló)
Hungarian Szürke-víz
Russian Гватло
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