 They are located in the district of Chacona, part of the town of Güímar on the island of Tenerife in the Canary Islands.The structures have been dated to the 19th century and their original function explained as a byproduct of contemporary agricultural techniques.Autochthonous Guanche traditions as well as surviving images indicate that similar structures (also known as, "Morras", "Majanos", "Molleros", or "Paredones") could once have been found in many locations on the island.