The River Dargle is one of Ireland's premier sea trout rivers, rising on the northern slopes of Djouce Mountain in the Wicklow Mountains and flowing approximately 14 kilometres in a north-easterly direction before emptying into the Irish Sea at Bray Harbour. The river's name derives from the Irish An Deargail, meaning "little red spot," a reference to the prevailing tint of its rocks — a reflection of the mixed geology of granite, slate, shale, and schist that characterizes the catchment. The Dargle's journey from the uplands is dramatic: it flows over Powerscourt Waterfall, the highest waterfall in Ireland at 121 metres (398 feet), before passing through the beautiful Dargle Glen in a series of rapids and waterfalls. The catchment spans approximately 128 square kilometres, encompassing granite uplands, glacial valleys, wooded gorges, agricultural land, and urban development near the coast at Bray. Key tributaries include the Glencree, Glencullen, Kilmacanogue River, and Lough Bray. The river is classified as a salmonid river and is widely regarded as one of Ireland's finest sea trout fisheries.