We need to know exactly when the river will flood ... highlands of Ethiopia each year would cause the Nile to flood as it flowed through Egypt. Farmland could be covered by up to two metres ...

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CONNOR: Wow! Ah, we made it to the very start, the source, of the famous River Tay. ISLA: Follow it to the end, we’ll be in Dundee! Look at the map. Rivers usually start somewhere high up ...