There were four cisterns in the town, one of them was certainly municipal, the second was military, the third might have belonged to a monastery complex, while the fourth was certainly private.
The cistern is from the Venetian period and there is data from 1517about it. It had two well heads with a chiseled coat of arms of an aristocratic family and the Venetian lion, the symbol of the "Serenissima". The military cistern had certainly been constructed before bringing water trough aqueducts during the Ottoman rule. It was used as a spare cistern inside the castel. Since the castle was a refugium (a refuge) it had to have water reserves in case of a siege. It is rightly supposed that the cistern belonged to a monastic community, because it is inside the complex which has St Veneranda's Church as its part. This church is believed to have been part of a Dominican monastery.
There were private cisterns in the town. One of them was found in the complex of houses, in the building(25).
In the south-eastern part of the town there is a bíg vaulted construction - the tunnel(34) which safely led the water in the Lower Town. This construction was needed in case of a siege.It was built on a steep side of a slope so that coming down had an angle. the ascending was done through a flight of stairs partly carved into a rock. The walls were made of big stones and mortar. It was most likely made during the Ottoman rule.