An Abhainn Mhór (meaning 'the big river') is the Irish name for several rivers etc. in Ireland:
Avonmore River, flows from the Wicklow Mountains to the Irish Sea at Arklow Munster Blackwater, flows from Kerry through counties Cork and Waterford into the Celtic Sea at Youghal Harbour A former name for Avoca, County Wicklow, a small town Owenmore River (County Mayo), flows from the Nephin Beg Range of mountains into the Atlantic at Tullaghan Bay Owenmore River (Connemara), flows from Ballynahinch Lake to Bertraghboy Bay Owenmore River (County Sligo), a river in County Sligo Owenmore River (County Cavan), a river in County Cavan