Lake Albano. Lake Albano is a small volcanic crater lake in the Alban Hills of Lazio, at the foot of Monte Cavo, 20 km southeast of Rome.
Castel Gandolfo, overlooking the lake, is the site of the Papal Palace of Castel Gandolfo. In Roman times it was known as Albanus Lacus and lay not far from the ancient city of Alba Longa.
With a depth of about 170 m, Lake Albano is the deepest in Lazio. The lake is 3.5 km long by 2.3 km wide, and was formed by the overlapping union of two volcanic craters, an origin indicated by the ridge in its center, which rises to a height of 70 m. Plutarch reports that in 406BC the lake surged over the surrounding hills, despite there being no rain nor tributaries flowing into the lake to account for the rise in water level.
The ensuing flood destroyed fields and vineyards before eventually pouring into the sea.It is thought to have been caused by volcanic gases, trapped in sediment at the bottom of the lake and gradually building up until suddenly releasing, causing the water to overflow. Around 395BC, during the wars between Rome and Veii, a discharge tunnel was built crossing the crater walls.It served as an emissary whenever the water level overflowed its mouth.According to Titus Livius, this feat of engineering was incited by the Oracle of Delphi: the Roman victory against Veii would be possible only when the lake waters were channeled and used for irrigation.T