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length in United Kingdom — 18 km
River Afon Eirth — one of the area's fishing spots. About 18 km long. This page shows an hourly bite forecast for today and the week ahead; the algorithm factors in the weather, atmospheric pressure, and the moon phase. The river runs through Gwynedd and Powys — the bite forecast is computed for each stretch separately, from the weather of its own region. Across the whole river, european eel, pike and whitefish are the most active today.