is 150 feet below Lake Nemi. Its outlet conducts its waters to the
Tiber. This lake also occupies the crater of an extinct volcano; it is
six miles round, and of unknown depth. The outlet was made at the time
the Romans were besieging Veii, B.C. 394, to lower the waters which
threatened to flood the Campagna. It is 1509 yards in length.
_Situated on the bluff overlooking the lake is_