In the outer arc of the loop in the river Genil limits described in closer to the homes of Cockaigne, lies a kind of wall, approximately, three feet high and thirty or forty feet long; its purpose was to prevent the river overflowed into the town and also direct the course of the same to a particular place, which is none other than an old building known as aceña, remains of what was once flour mill, which took advantage of water power as the driving force for grinding wheat and making flour.
Etymologically, aceña is a word that comes the Arabic "al saniya" and that means flour mill located within the riverbed. Archaeological remains preserved there agree on the meaning of this word and function described above.
This Arab aceña remains almost as Arabs trace puediron. The mill buildings, thick stone walls with ashlar masonry and masonry and openings formed by arches, virulence have suffered great river floods, sometimes reaching to be covered by the three or four meters of water reached the normal level of the place. Hence, these mills have been rebuilt after the time, especially in the eighteenth century, time researchers say they had a very regular use.
This architectural, closely related to water, was probably driving the urban core of Cockaigne in the Middle Ages. Situated on the right bank of the river Genil, Arab Acefia of Cockaigne was a building for grinding grain.
Nowadays, la aceña árabe forma parte del complejo turístico de Jauja, junto al paseo fluvial del Río Genil, la zona de barbacoas, la piscina o el chiringuito.