54°05′53″N6°11′31″W / 54.098°N 6.192°W /54.098; -6.192
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Cloughmore orCloghmore (from Irish An Chloch Mhór 'the big stone'),[1] known locally as "The Big Stone", is a huge granite boulder perched on a mountainside almost 1,000 feet (300 m) above the village ofRostrevor,County Down,Northern Ireland.[2] It sits on the slopes of Slieve Martin inKilbroney Park, overlooking Rostrevor Forest,Carlingford Lough and theCooley Peninsula. It is popular destination for visitors, and is part of a National Nature Reserve and Area of Special Scientific Interest.[3]
The granite boulder, which has a calculated mass of 50 tonnes,[4] is aglacial erratic, thought to have been transported fromScotland (from an island inStrathclyde bay)[5] and deposited about 10,000 years ago by retreating ice during thelast Ice Age.[2] It sits on a relatively flat area of Silurian metasedimentary rock.
Local legend has it that the stone was thrown from theCooley Mountains, on the other side of Carlingford Lough, byFionn mac Cumhaill.[2]
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