Kuraigana Island

Kuraigana Island (クライガナ島 Kuraigana-tō, Gloom Island in the Viz Manga and FUNimation subs) is a dark and gloomy place in the Grand Line. It was once the home of the now fallen Shikkeāru Kingdom (シッケアール王国 Shikkeāru Oukoku, Muggy Kingdom in the Viz Manga and FUNimation subs). The forest island is relatively deserted except for some ruins. Amongst its landscape, the island possesses unique hills. These hills resemble the Curly Hill in the animated film The Nightmare Before Christmas. The name of the island, Kurai, means dark in Japanese.

It was revealed that, 7 years before the current storyline, a terrible war was fought on this island. The baboons inhabiting the forest, gifted with the capability of learning from humans, watching the conflict learnt how to fight using weapons, and became fearsome fighters. Just after the war's end, Juracule Mihawk arrived on this island and made its castle his house.

Perona was sent flying here by Kuma's Nikyu Nikyu powers when she told him where she wanted to go if she went on a trip. Upon arrival, she settled in one of the ruins. Roronoa Zoro was later sent to this island by the same Shichibukai. The two met up with the world's greatest swordsman as he returned from the Battle of Marineford. Mihawk told Perona about Gecko Moria's presumed death, and gave Zoro a little boat to return to his crewmates, later telling him about the island's history and warning him about the baboons' threat.