The Lower Shannon is one of Ireland's most storied and productive fisheries, stretching from O'Briensbridge downstream through Castleconnell to Thomond Bridge in the heart of Limerick City, and encompassing the vast and celebrated Lough Derg — the largest lake on the Shannon system and the third largest lake on the island of Ireland. Lough Derg alone covers over 13,000 hectares (32,123 acres), stretches more than 30 km in length, and reaches 15 km at its widest point, making it a genuinely impressive body of water capable of producing world-class fishing across multiple species. Below Lough Derg, the river narrows and quickens before eventually widening into the Shannon Estuary, an 80 km tidal reach that offers outstanding sea fishing all the way to the Atlantic. The fishing rights of the main river channel are vested in the Electricity Supply Board (ESB), and the Lower Shannon is managed as a mixed fishery of exceptional quality, drawing anglers from across Ireland and Europe for its trout, salmon, coarse fish, pike, and sea species.