The River Bann is a large river in County Wexford, in the southeast of the Republic of Ireland. The river rises in the southern slopes of Croghan Mountain in north Wexford on the County Wicklow border. It flows south and is joined by the Blackwater Stream near the village of Hollyfort. Veering southwest it passes under the R725, then continuing southw…The River Bann is a large river in County Wexford, in the southeast of the Republic of Ireland. The river rises in the southern slopes of Croghan Mountain in north Wexford on the County Wicklow border. It flows south and is joined by the Blackwater Stream near the village of Hollyfort. Veering southwest it passes under the R725, then continuing southwestwards it flows beneath the N11 national primary route at the village of Camolin.