River Boyne, river rising in the Bog of Allen, County Kildare, Ireland, and flowing 70 miles (110 km) northeast to enter the Irish Sea just below Drogheda Neolithic passage graves at Knowth, Newgrange, and Dowth are of archaeological significance, and nearby in the Boyne valley is Tara, seat ofMaintenance Dredging of the commercial estuary of the River Boyne and seaward approaches at Drogheda Port Partial reuse of dredged materials with remaining dredged materials to be dumped at sea under an EPA licenceDrogheda, Irish Droichead Átha ("Bridge of the Ford"), urban district and seaport on the southern border of County Louth, IrelandDrogheda lies along the River Boyne about 4 miles (65 km) from its mouth Drogheda was a stronghold and trading post of the Norsemen in the 8th–11th century and of the AngloNormans in the 12th century Amazon Com River Boyne Drogheda Co Louth Ireland Poster Print 15 X 12 Posters Prints Boyne river walk drogheda