Kirishima-Yaku National Park (霧島屋久国立公園 Kirishima-Yaku Kokuritsu Kōen) is a national park in Kyūshū, Japan. It is composed of two parts: Kirishima-Kagoshima Bay, an area of Kagoshima Prefecture and Miyazaki Prefecture known for its active volcanoes, volcanic lakes, and onsen; and Yakushima, an island south of Kyūshū in Kagoshima Prefecture, known for its cryptomeria or yakusugi (屋久杉 ).