The
lake of Averno lays inside a volcanic crater which
was born during a violent and explosive eruption
about 4000 years ago . It is between the Monte Nuovo
(in the south-east ) and Monte Grillo (north-west);
it is separated from the close Lucrino lake through
the tufaceous spur of the Monte delle Ginestre.
The Averno pumices and ashes cover stratigraphically
the volcanic materials of Baia's volcans and they
are on their east side covered by the materials
of the eruption of the Monte Nuovo. Before this
event, this lake was in communication with the one
of the ancient Lucrino.
The slices of land lightly pendent and next to the
lake coasts are taken up by citrusplantations, orchards
and vegetables.
Regarding the inner slopes, the east one is used
for cultivating vines and vegetables; the other
ones are just partially covered by terraces because
in the most part there are chestnut and ilex copses
and mediterranean wood .