The well is entirely dug into the lithoid tufa of the cliff of Orvieto: it is 36 meters deep, including the meters of spring water at the bottom.

It consists of two parts that have been unified: the larger one, circular in cross section and with an average diameter of 3.40 meters, and a smaller rectangular shaft, measuring 60 x 80 cm, and with the typical Etruscan "pedarole" or footholds which made it possible to climb in and out at the sides.

A tunnel about 1.7 meters high and approximately 20 meters long opens out inside the rectangular portion at a depth of 30 meters; the bottom, almost completely covered with mud and clay, has a deep groove on the left side along which the water from the well ran.

Various grooves to be found on the upper part of the entrance of this walkway were made by the ropes that were probably used to excavate the well or to transport water.

Five holes set at regular intervals along the cylindrical wall appear at the base of the tunnel.; they may have been used to house the beams of a platform or a device to lift water from the spring.