Xerez Cromlech

The Xerez Cromlech is believed to date back to the 4th or 5th millennia BCE. It is located near the town of Monsaraz, close to the Spanish border. The present site of the cromlech is not its original location. Due to the construction of the Alqueva Reservoir, which led to the flooding of the original site from 2002, it was transferred from an area that is now under water to its present site.

The Xerez Cromlech is not round, but, in fact, square. There has been some dispute about the authenticity of the square layout. When first discovered, the stones had been widely dispersed due to agricultural work and an initial survey only identified 12 stones that could be part of a cromlech, although the present layout has 55. As the original site is now under water it is unlikely that the dispute will ever be resolved.