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length in United Kingdom — 8 km
River Afon Claerwen — a spot well known among anglers. About 8 km long. A smart bite calendar — moon phase, atmospheric pressure, and weather combined into an hourly fish-activity forecast for the coming days. The river runs through Ceredigion and Powys — the bite forecast is computed for each stretch separately, from the weather of its own region. Across the whole river, dace, european eel and grayling are the most active today.