Early Venetians abandoned the mainland for the swamp lagoon islands due to increasing threat of invasion by barbarian tribes. The islands were easier to defend and provided natural protection against attacks. Additionally, the islands offered access to the sea, facilitating trade and eventually leading to the flourishing of Venice as a maritime power.
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To flee the invading Lombards from the north
Early Venetians abandoned the mainland for the swampy lagoon islands due to increasing invasion threats from barbarians and the Huns in the 5th century. The islands provided natural defenses and allowed for easier defense against potential attacks. Additionally, the marshy environment of the lagoon helped in supporting the early Venetians' maritime trade and fishing activities.
Barrier islands are long, narrow, and low-lying islands that run parallel to the mainland coast. They are typically separated from the mainland by a lagoon or salt marsh. They form through a combination of processes such as sediment deposition by coastal currents, waves, and tides.
Venice is located across 117 small islands in the marshy Venetian Lagoon. The Lagoon is along the shore between the River Po and the River Piave
A grouping of coral islands is called an atoll. Atolls are formed from coral reefs that have grown on the remnants of volcanic islands that have sunk in the ocean. They usually form a ring shape with a lagoon in the center.