Ancient cistern of Arab origin a few hundred meters from the Calatubo fortress. Its construction dates back to the period 1000-1100 AD and collects the waters of a nearby spring which flow into a closed basin included in a stone artefact cemented with mortar and with a domed roof (small cuba, from the Arabic qubbah, “vault, vaulted room”), a vault with a hemicylindrical section, similar to that covering the dammusi. This artefact has a window on the front and one on the north wall; while the window on the rear wall was walled up. From this first closed tank, the water passes into the second outside tank which served as a drinking trough for large animals and subsequently into lower tanks, to quench the thirst of smaller animals. From there the water, through cunnutti, stone pipes with a "u" section, was distributed to the surrounding gardens.
Testimonies reported from father to son say that Cuba had in the past been surrounded by a palm grove, a garden, rich in precious essences, and a beautiful rose garden.