|The following article has no or few references to the official sources.|
|Debut:||Chapter 597; Episode 516|
|Type:||48 season island|
There are several different species of dangerous animals on it. Boa openly stated that the island is dangerous even by Kuja standards. A country supposedly used to exist on this island, but its people could not survive against the extreme environment and died out.
After the time-skip, Monkey D. Luffy owned the island.
Rayleigh took Luffy here to train him in the use of Haki for two years. After the first year and a half, Rayleigh left Luffy on his own after he taught him the basics of Haki. After another half a year, Luffy became the "boss" of the island, and even befriended some of the animals (which Luffy considered a mistake, as he could not eat them). He departed when the time came, with the Kuja Pirates coming to pick him up.
- "Rusukaina" means "Anybody home?"