Nippo Coast is a 120 km ria coast from Saganoseki Peninsula in Oita Prefecture to Mimitsu Beach in Hyuga City, Miyazaki Prefecture in the eastern part of Kyushu. This ria coast was formed by the subsidence of the ground due to the crustal movement of the Kyushu Mountain Range, which separated Kyushu from Shikoku. The name “Nippo (日豊)” is the combination of the names of old provinces, Hyuga (日向) province (present Miyazaki Prefecture) and Bungo (豊後) province (present Oita Prefecture). The whole part of the coast is designated as Nippo-Kaigan Quasi-National Park.
Seen from Cape Hyuga, which is protruding in to the Hyuganada Sea, the white splashes of restless waves make an exquisite contrast with the continuing sheer cliffs. As the seawater is warm and clear, various marine animals such as table corals, Favia corals and stony corals inhabit in the sea.