This site generates income via partnerships with carefully selected travel brands and/ or purchases made through links to them. As an Amazon Associate I earn from qualifying purchases. See why this is important.Rannach Crom Dubh is the largest stone in the Grange Stone Circle near Lough Gur. The stone weighs 40 tons and was moved a distance of 3 miles in, approximately, 2200 BC, by Bronze age man.