The Old Fortress of Corfu (Παλαιό Φρούριο), Krf - stara tvrđava

The Old Fortress of Corfu (Greek: Παλαιό Φρούριο, Venetian: Fortezza
Vecchia) is a Venetian fortress in the city of Corfu. The fortress
covers the promontory which initially contained the old town of Corfu
that had emerged during Byzantine times.

Before the Venetian era
the promontory, which lies between the Gulf of Kerkyra to the North and
Garitsa Bay to the south, was defended by Byzantine fortifications which
the Venetians largely replaced with fortifications of their own design.
As part of their defensive plans the Venetians separated the
promontory from the rest of the city of Corfu by creating the
Contrafossa, a moat which is a sea channel connecting the Gulf of
Kerkyra to the North with the Bay of Garitsa to the South, converting
the citadel into an artificial island. The fort successfully repulsed
all three major Ottoman sieges: the great siege of 1537, the siege of
1571 and the second great siege of Corfu in 1716.