Japan is a mountainous country. The level ground, including artificial terraces, is barely 12 per cent of the area of the whole empire. A long range of high mountains runs like a backbone through the main island. The highest peak is the famous Fuji, which rises 12,365 feet above the sea-level, and is a “dormant volcano,” whose last eruption occurred in 1708. Its summit is covered with snow about ten months in the year.[10] There are several other peaks of more than 8,000 feet elevation, such as Mitake, Akashi, Shirane, Komagatake, Aso, Asama, Bandai, some of which are active volcanoes. Eruptions happen not infrequently; and earthquakes, more or less severe, registered by the seismometer, are of daily occurrence, although most of the shocks are not ordinarily perceptible. There are also several excellent hot springs, of sulphuric or other mineral quality, as at Ikao, Kusatsu, Atami, Hakone, Arima, Onsen. The mountainous character of Japan has also its pleasant features, because it furnishes means of escape from the depressing heat of summer. Karuizawa, Nikkō, Miyanoshita, Hakone, Arima, Chūzenji are the most popular summer resorts. There are not many, or large, lakes in Japan. Lake Biwa, 50 miles long and 20 miles wide at its widest point, is the largest and most famous. Hakone Lake, the “Asiatic Loch Lomond,” is beautiful, and especially noted for the reflection of Mount Fuji in its water by moonlight. Lake Chūzenji, in the Nikkō mountains, is regarded by many as “unrivalled for beauty” and “hardly surpassed in any land.” There are many beautiful waterfalls, such as Kegon, Urami, and others in the Nikkō district, Nunobiki at Kōbe, Nachi in Kii, etc. There are numerous rivers, short and swift; and it is these streams, which, after a rainy season, swelling and rushing impetuously down from the mountains, overflow their sandy banks and cause annually a terrible destruction of life and property. The most important rivers are the Tone, the Shinano, the Kiso, the Kitakami, the Tenryū, in the main island, and the Ishikari in Yezo. The last is the longest (about 400 miles); the next is the Shinano (almost 250 miles); but no other river comes up even to 200 miles in length. The Tenryū-gawa[11] is famous for its rapids. Some of these rivers are navigable by small steamers.