This map shows areas where cropcircles were seen and reported. The greatest concentration of cropcircles are found in South England (Wiltshire), between Salisbury and Swindon. This area is also where most prehistorical sites are found ( Stonehenge, Aveburys Stonecircle, Silbury Hill, the white Horses and the longbarrows ). Cropcircles are found around such sites. This applies, not only to England, but all over the world were cropcircles have been discovered. There seem to be a relationship and not pure coincidence that cropcircle are occasionally observed around these sites.