Northen Europe the British Isles Western France - cradle of Atlantic megalith building? northern and eastern France, and Switzerland southern France, Catalonia, and the Basque country the Iberian peninsula the west Mediterranean islands and south Italy Africa, the Arabian peninsula, and Madagascar the near East - Syria, Lebanon, Israel, and Jordan the Caucasus India the Far East - China, Korea, and Japan South America - the huila at San Augustin in Columbia.
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A 1988 study studied this question.