The River Liffey is one of Ireland's most storied angling destinations, rising in the Liffey Head Bog near Kippure in the Wicklow Mountains and flowing through the Sally Gap before entering Poulaphouca Reservoir. From there it winds through counties Wicklow, Kildare, and Dublin before emptying into Dublin Bay. The catchment covers approximately 1,250 km², and the river's character changes dramatically along its length — from peat bog and granite headwaters in the upper reaches, through sandstone and shale middle sections, to limestone-influenced lower reaches passing through agricultural land and ultimately urban Dublin. Three hydroelectric dams and reservoirs were constructed in the 1930s and 1940s at Poulaphouca, Golden Falls, and Leixlip, fundamentally shaping the river's hydrology and fish distribution. The Liffey is renowned for its clean water and healthy populations of wild brown trout, and it offers a genuinely diverse angling experience across its many miles.