The King's River in County Kilkenny is a limestone-based tributary of the River Nore, flowing through a richly wild and largely undisturbed landscape in southeast Ireland. The river is part of the broader "Three Sisters" catchment — the Barrow, Nore, and Suir — that drains southeastern Ireland into a common estuary at Waterford. The King's River is known for its genuinely wild character, with sections left largely free from human interference, giving anglers a true sense of fishing in untouched nature. Dense briars, brush, and woodland line much of the riverbank, and the terrain is navigated more by deer trails than by formal footpaths. The limestone geology underpins excellent water quality and a rich invertebrate base, making the King's River a productive and rewarding fishery for wild brown trout.