This map shows the extreme
volcanic nature of the Campiflegrei. (There is an article
on the Geology of the Bay of Naples. You may link to the
'Pozzuoli' section of that article clicking here.) This
area was the home port for the Western
Imperial Fleet. Besides the bay, itself, other
smaller bodies of water were important as training
facilities. (These are circled in red; they are not
linked.)
Since this map is from the last
500 years, however, there is a feature that did not exist
at the time of the Romans and their fleet: the yellow
circle shows Monte Nuovo, a
recent appearance in the 1500s. The eruption that formed
that small mountain effectively destroyed or at least made
a lot smaller—the adjacent Lake Lucrino, which, at the
time of the Romans, was a large training lake.
[Also see the graphic in this
item on the Archiflegrean Caldera.]
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this is map 7 to map 8--->