Theory The only countries that survived the cleansing

#1
The gorosei’s dialogue during reverie suggests that there has been a massive flood before. Probably during the void century.

My guess is that only a few countries survived this cleansing:
  • Skypiea
  • Zou
  • Wano
  • Elbaf
  • Fishman island
Skypiea is in the sky

Zou and wano are high above the sea level

Elbaf has a giant tree, which imo the giants used to survive

FI wouldn’t be effected by sea levels

All of these locations seem to be of importance to the ancient kingdom. Zou, Wano, and FI all had road poneglyphs(FI’s was moved). These locations are also all tied to ancient weapons.

Wano and FI actually have ancient weapons whereas Zou is needed to unlock pluton.

Skypiea also had the gold city and a poneglyph.

Imo it is highly likely that the Ancient Kingdom left something of great importance in the elbaf tree. I’m guessing probably Uranus. Uranus is god of the sky, so it makes sense that it would be in the elbaf tree, which is really tall.
 
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