The Afon Wysg — known in English as the River Usk — is one of Wales' most celebrated fishing rivers, and its Welsh name says it all: "river abounding in fish." Stretching 125 kilometres (78 miles) from its source on the northern slopes of the Black Mountain in the westernmost reaches of the Brecon Beacons National Park, the river descends from an elevation of 502 metres (1,647 feet) before flowing north into the Usk Reservoir, then east through Sennybridge and Brecon, turning southeast past Talybont-on-Usk, Crickhowell, and Abergavenny, before taking a southerly course to meet the Severn Estuary at Uskmouth, Newport. With a catchment basin of 1,160 square kilometres, the Usk drains a diverse landscape of upland moorland, pastoral valleys, and lowland floodplains, creating a rich variety of habitats that support an exceptional range of fish species. Designated as a Special Area of Conservation (SAC), the river is managed with the highest conservation standards, and its reputation as both a premier salmon river and one of the finest wild brown trout fisheries in the entire United Kingdom is well-earned and long-standing.