Rusukaina

Calm Belt · first appeared: Ch. 597

Profile

A deserted island northwest of the Island of Women (Amazon Lily), inside the Calm Belt. Chosen by Silvers Rayleigh as the ground for Luffy’s two-year training because of its brutality. Notable features (all stated on-page Ch. 597 pp. 9–11):

• The “48 seasons” — a different season every week of the year.
• Over 500 ferocious beasts, every one stronger than Luffy at the start of training (giant elephants, big cats, etc.).
• Ancient ruins — “inhabited in ancient times, but those people lost the battle for survival.” An extinct ancient civilization once lived here.

Rayleigh forbids Hancock and all women from visiting so the survival pressure stays maximal. The training officially begins at chapter’s end.

Etymology

Confidence: high · ルスカイナ Rusukaina is a goroawase pun on 留守かいな rusu kai na — colloquial (Kansai-flavoured) for “nobody home, huh?” / “is no one in?” (留守 rusu = absence / away-from-home / empty house; かいな kaina = the casual interrogative “isn’t it?”). The name labels the island for precisely what it is — a deserted, uninhabited wilderness — and quietly echoes its extinct ancient civilization (“inhabited in ancient times, but those people lost the battle for survival,” Ch. 597 pp. 9–11). VIZ/Funimation render it “Ruskaina”; Funimation’s 3D2Y special sub used “Luscaina.” Source: One Piece Wiki — Rusukaina.