The Slayne is a river in Cape Wrath in the stormlands. Known for its rapids, pools, and waterfalls, the Slayne flows south from the northeastern Red Mountains to the Sea of Dorne. The castle of Stonehelm, the seat of House Swann, overlooks the Slayne, a major river route in the stormlands.
In the Battle by the Bloody Pool, King Durran the Young is said to have dammed the Slayne with Dornish corpses. During the coming of the Andals, King Cleoden I Durrandon allied with three Dornish kings and defeated the Andal warlord Drox the Corpse-Maker on the river.