Aqua-Irava

Aqua-Irava is the home planet which acts as the homeworld of Hurihiko (Hydro-Girl) and other Aqua-Iravians, and was created millennia ago by sisters Omeka and Kino. Aqua-Irava sits behind the Sun and sits behind a Saturn-like planet, where it remained hidden from humanity for many decades.

Humanity eventually discovered Aqua-Irava, as Sigma Research would manage to open a gateway into Aqua-Irava's crystal caves. Various research teams on Earth have theorized about a hidden planet behind the Sun that they refer to as "Counter-Earth", but they have yet to confirm this.

Details
Aqua-Irava's atmosphere and gravity appears to be very similar to Earth as well as the oxygen levels, the planet also resembles Earth but the scenery is rich with many trees and waterfalls that glow under the Sun's light.

There is an underground section of Aqua-Irava that lays in ruins due to the Luciferians' attack years ago, this is where Omeka is usually found and was also the place where Tesla trained Hurihiko.

Another are of Aqua-Irava is the ice regions where Hurihiko's cousin, Yuki, lives as well as other Aqua-Iravians that were born in that area. The ice region was immensely decreased due to the Luciferian attacks, but the stubbornness of its people resulted in them staying with their homes.

In the centre of Aqua-Irava is a strange section covered in giant mushroom-like plants with bioluminescence flora, this area doesn't resemble the rest of the planet and even features a different sky. this was where Hurihiko was christened as the demigoddess of Aqua-Irava by Omeka.

On both edges of Aqua-Irava sit very important areas, one the right side of the planet is the Valley of Crystals where various blue and purple crystals are partially embedded into the surrounding structure. These crystals represent Hurihiko (blue) and Kino (purple), Hurihiko's crystals were formally yellow to represent Omeka but they changed due to the inevitable future event of Hurihiko becoming Aqua-Irava's goddess.

Kino's crystals were originally supposed to become blue as well, but Kino refused to give up her place and her crystals remained purple.