Aqua Laguna

Aqua Laguna is an annual high tide that takes place in Water 7. It engulfs the lower part of the city with a huge wave, causing a huge flood. Every year during the Aqua Laguna, all citizens evacuate from the lower parts of Water 7 and into higher ground. After each Aqua Laguna, part of Water 7 sinks, causing the city to constantly receive repairing.

Overview
The water that makes up the Aqua Laguna comes from Long Ring Long Land in the once-in-a-year time when the sea level lowers exposing the ring of land connecting the islets among each other. Since the Aqua Laguna is becoming more and more violent every year, the ground level of Water 7 is sinking day by day. To counter this, after the raid on Enies Lobby, mayor Iceburg decided to convert Water 7 into a ship, in order to prevent the city from being destroyed.

Anime and Manga Differences
In an anime filler episode, it was shown that on the roofs of the houses in the lower part of the city lies salt from All Blue, as the Aqua Laguna carries water from all of the world's seas. This salt improves every dish, and Sanji stockpiled it before leaving. However, this is non-canon.

Trivia

 * Oda explained in an SBS that this came from the Acqua Alta (High Water in Italian), a similar phenomenon (but much less important) that happens in the Adriatic sea, and so in Venice, where it is an important problem due to the fact that the city itself is on the Venetian lagoon.

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