The Red Fork is one of the three main rivers of the Trident in the riverlands, the other two being the Blue Fork and the Green Fork. It is named after the mud and silt from the western mountains; Ser Brynden Tully considers the red mud to be colored Tully red.
The Red Fork's headwaters are in the hills near Hornvale and Deep Den in the westerlands. It then flows northeast past Pinkmaiden, the Mummer's Ford, Sherrer, and the Stone Mill to Riverrun, where it is joined by the Tumblestone. The Tullys are able to open sluice gates on the third side of their castle, turning it into an island.
From Riverrun the Red Fork continues east past the Skipping Stones and Red Deer Island until it meets the Trident north of Lord Harroway's Town. The Trident then continues east to the Bay of Crabs. Stone Hedge is located south of the Red Fork and east of Riverrun, while Raventree Hall is north of the river and south of the Blue Fork.
While the deeper and faster Tumblestone is blue and white in color, the placid and wider Red Fork is muddy red and brown. It meanders with loops and bends, islands and sandbars. The west bank is higher and more wooded than the east bank. The river road follows much of the course of the Red Fork.
During Aegon's Conquest, Torrhen Stark, the King in the North, submitted to Aegon the Conqueror along the shores of the Red Fork of the Trident. The Inn of the Kneeling Man is said to be where Aegon accepted Torrhen's surrender.
During the Dance of the Dragons, Lord Jason Lannister was slain by Pate of Longleaf in the Battle at the Red Fork. Sallydance on the Red Fork was attacked by Prince Aemond Targaryen and his dragon Vhagar during the civil war.
A Game of Thrones
Ser Gregor Clegane raids Wendish Town, Sherrer, and Mummer's Ford, but retreats across the Red Fork back to the westerlands before Ser Raymun Darry can respond. The Hand of the King, Lord Eddard Stark, sends Lord Beric Dondarrion to bring Gregor to justice, but Beric's force is ambushed at the Mummer's Ford by the Mountain's men after crossing the river, however. Marq Piper and Karyl Vance retaliate by raiding lands of the westermen across the Red Fork.
A Clash of Kings
Returning from Storm's End, Catelyn Stark crosses the Red Fork at a ford south of Riverrun. Her brother, Ser Edmure Tully, fortifies the river to prevent Lord Tywin Lannister from crossing; the rivermen successfully defeat Tywin's attempted crossing in the Battle of the Fords.
A Storm of Swords
Brienne of Tarth, Ser Cleos Frey, and Ser Jaime Lannister travel along the Red Fork east from Riverrun as far as the Inn of the Kneeling Man, soon after which they head inland. The inn's cook mentions that outlaws have been preying where the channel has been silting up by a couple of sunken boats, as well as further downstream around the Skipping Stones and Red Deer Island.
A Feast for Crows
Emmon Frey and Forley Prester are encamped south of the Red Fork during the siege of Riverrun. To prevent escape, the besiegers throw a boom across the river downstream of the castle, with Manfryd Yew and Raynard Ruttiger defending the boom. Ser Brynden Tully swims under Riverrun's Water Gate in the night and presumably escapes down the Red Fork.
The Red Fork was wide and slow, a meandering river of loops and bends dotted with tiny wooded islets and frequently choked by sandbars and snags that lurked just below the water's surface.
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