Climbing Mt Fuji, the World Heritage site, is predominantly popular in Japan. It only takes 1-2 days for both ascending and descending, but the view from its peak is speechless. It is not a well-known fact in the world that Japan is mountainous. The Japan Alps stretches through 4 prefectures on Honshu, the main island and it is one of the perfect spots for mountain climbing and rock climbing. They offer a range of climbing levels throughout Japan, depending on your experience and physical ability.