According to Columbus SE Asia was the location of the old/former Paradise, Garden of Eden.
You try to interconnect different stories with a different background:
1. Frisian background: Aldland must be the former Frisia. Apparently only Texel remained.
2. Classical background: Aldland has been connected with Atlantis, the unknown land beyond the Pillars of Hercules, Inka was looking for.
3. Biblical background: The great flood wich submerged the Frisian Aldland is connected with the biblical flood as is stated by the year 2193 BC.
4. Mythological background: Gods are born from mountains. so did Finda.