Aqua Laguna

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

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 that connects the islets to each other. When Aqua Laguna arrives at Water 7, the water level recedes away from the island; the farther the water recedes, the larger and more destructive the following tidal waves will be.

The Aqua Laguna seen during the Water 7 Arc was noted to be much worse than normal, so it’s is unknown what a standard Aqua Laguna looks like.

Even during a normal Aqua Laguna, no ship can sail through the powerful storm and waves without being destroyed. Only a Sea Train has a chance of getting through.

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 and prevent the city from being destroyed, after the raid on Enies Lobby, mayor Iceburg decided to convert the entirety of Water 7 into a ship.

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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