Lough Carra, County Mayo – A Lake beside Lough Mask Between Ballinrobe, Ballintubber and Claremorris. Lough Carra is located in the Barony of Carra, County Mayo, which is about 8 miles away from Castlebar, which is the county town of County Mayo and the largest town in it. Lough Carra is 6 miles long and it drains into the Lough Mask via the Keel River.