Mount Tsukuba or Tsukuba-san as it is known to the Japanese is an 877 meter high mountain located near Tsukuba Science City. It is one of the most famous mountains in Japan, particularly well-known for its double peaks, Nyotai-san and Nantai-san. Many people climb the so-called "purple mountain" every year for the panoramic view of the Kanto plain from the summit. On clear days the Tokyo skyline, and even Mount Fuji are visible from the mountain top. Most mountains in Japan are volcanic but Mount Tsukuba is composed of non volcanic rock such as granite.