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length in Ireland — 19 km
Mongagh River — a spot well known among anglers. About 19 km long. See when the bite is best: hourly fish activity for the days ahead, computed from the weather, pressure, and season. The river runs through County Meath, County Offaly and County Westmeath — the bite forecast is computed for each stretch separately, from the weather of its own region. Across the whole river, european eel, pike and perch are the most active today.