Mount Fuji, standing at 3,776 metres, is Japan's highest mountain and an active stratovolcano located on Honshu island, roughly 100 kilometres southwest of Tokyo, straddling the border of Shizuoka and Yamanashi prefectures. It is the correct answer because it uniquely satisfies all three conditions in the question: it is the tallest peak in the country, it remains classified as an active volcano (its last confirmed eruption was in 1707-1708, the Hoei eruption), and it was inscribed by UNESCO in 2013 as a Cultural World Heritage Site under the title 'Fujisan, sacred place and source of artistic inspiration', recognised for its influence on Japanese art, literature and religious pilgrimage traditions rather than for natural criteria alone. Its symmetrical cone shape has made it a recurring subject in ukiyo-e woodblock prints, most famously Hokusai's 'Thirty-six Views of Mount Fuji'. Mount Aso, located on Kyushu island, is incorrect because although it is also an active volcano famous for having one of the largest calderas in the world, it stands only around 1,592 metres tall, far short of Fuji's elevation, and lacks Fuji's UNESCO cultural listing. Mount Yari, in the Northern Japanese Alps on Honshu, is incorrect because at about 3,180 metres it is a well-known peak for mountaineers but is neither volcanic in the same active sense nor a UNESCO-listed site, and it ranks well below Fuji in height. Mount Tate (Tateyama), also in the Japanese Alps at about 3,015 metres, is incorrect for similar reasons: it is a sacred mountain in its own regional tradition but is not Japan's highest point and does not carry a UNESCO World Heritage designation.
