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
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.