The Xerez Cromlech (Portuguese: Cromeleque do Xerez), also known as the Xarez Cromlech, is a megalithic complex that is believed to date back to the 4th or 5th millennia BCE. It is situated near the town of Monsaraz in the Évora district of the Alentejo region of Portugal, close to the Spanish border. The present site of the cromlech is not its original location. Due to the construction of the Alqueva Dam for hydroelectric purposes, 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 close to the Orada Convent. This was the only monument to be moved, with the dam leading to the disappearance of prehistoric engravings and the Roman Castelo da Lousa.