These numerous island nations, scattered and sporadic, could only communicate with one another by boat.
In the face of the disaster of the toxic fire eruption, it was difficult for everyone to flee together, and many people could only stay on the island, silently awaiting the disaster's arrival.
The number of people that the ships could carry away was limited.
Even with several more trips, the number they could take away was still not significant.
But a great domain such as this had a population of tens of millions, even hundreds of millions.
Moreover, in the Southern Sea Island Domain where traffic relied solely on boats, shipbuilding thrived and vessels were plentiful; thus, each evacuation trip could carry away hundreds of thousands.
And besides, the toxic fire didn't erupt immediately.
The entire process spread slowly from south to north, gradually expanding over dozens or even hundreds of years.
