トカラ列島
Crossing the [[Tokara Islands]], [[Watase's Line]] marks a major biogeographic boundary. The islands north of the line belong to the [[Palearctic realm]] while the islands south of it are at the northern limit of the [[Indomalayan realm]]. Yakushima in Ōsumi is the southern limit of the Palearctic realm. It features millennium-old cedar trees. The island is part of [[Kirishima-Yaku National Park]] and was designated as [[World Heritage Site]] by [[UNESCO]] in 1993.