Water Realm

The Water Realm, known in Japan as the Plane of Water, is a realm mentioned in Magical Vacation, born from the concept of water. The water people originate from this realm, and Blueberry's family has ancestral connections to it.

History
Some time ago, the water people lived in the Water Realm as a single being that lived in a vast ocean. Before the events of the game, a swarm of enigmas invaded the Water Realm, causing the being of water to split into several smaller water people, and scattering them across various realms. Those who wound up in the Dark Realm created Akvavit Castle by drawing water from Muy Mot Desert.

Magical Vacation
Although the Water Realm was never visited in the game, a star in Arko said how he used to live there before dying. While they were alive, the Water Realm was in the midst of a war, and their child was sadly lost. They unleashed a spell that annihilated the universe, but perished instead while the universe remained.

When Blueberry graduated from Will-o'-Wisp Academy years later, she returned to the Water Realm to study her magic and befriend the water people.

Trivia

 * A country of frogs exists somewhere in the Water Realm. It is likely that the frog in Cabernet's hat is from there.