Underground Lake

The Underground Lake is a lake located in the Republic of East Gorteau.

Inhabitants

The lake is underground, and trees grow underwater. Ikalgo and the Ortho Siblings as well as their squads, who all carry the genes of water animals, can be found in this lake.

Plot
While trying to lose Flutter, Killua falls into this lake whilst fighting Ikalgo, who is almost eaten by his own grunts, but is saved by Killua.

Later on, Remora sneaks up behind Killua and attaches a badge that activates the Ortho Siblings' ability, Darts de Darts, and engage in a battle.