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The river's source is on the Irpinia Plateau, at 715 metres (2,346 ft) above sea level, below the plain of the Angel, near Avellino. From there it runs through parts of Campania and Basilicata into Apulia, where it is at its strongest, finally flowing into the Adriatic Sea near Barletta. At the end of its journey to the sea, the river ends in a delta and an estuary. The River Ofanto can have a torrential flow at times, with major floods along its course in the autumn and winter, thanks to heavy rainfall, but in the summer its flow can be remarkably slight. Despite its considerable length and the extent of its basin, the average flow of water at the river mouth is fairly low, less than 15 cubic metres per second (530 cu ft/s).