The 13th century Mozarabic cistern, declared a national historic-artistic monument in May 1931. It is a rectangular underground work (7'7 x 5'75 and 4,2 high), distributed in 9 compartments separated by 12 horseshoe arches, by 4 cruciform basins and horseshoe cone that support elongated groined vaults, made of masonry and ashlars.
The walls are made of reddish clay, probably to make them waterproof. Its storage capacity has been estimated at 120,000 litres.
