The Venetians fleeing the Lombards migrated into the lagoons along the Adriatic coast. Lagoons in the plural, as there were several, but what kind of environment was that, why was it there, and how did the Venetian settle in?
The invasion of the Lombards in 568 set in motion another migration. A part of the people of the Byzantine province of Venetia fled the Lombards, and headed for the areas which remained under the control of Constantinople.