Cloughmore, known locally as "The Big Stone" (from Irish an Chloch Mhór, meaning "the big stone"), is a huge granite boulder found about 1,000 feet (300 m) above the village of Rostrevor, County Down, Northern Ireland, on a relatively flat area of Silurian metasedimentary rock on the side of Slieve Martin overlooking Carlingford Lough and the Cooley peninsula in Co. Louth.