Yamanashi Prefecture


July 5, 2022

Yamanashi Prefecture (Yamanashi Prefecture) is a prefecture located in the central region of Japan. The prefectural office is located in Kofu City. It forms a part of the metropolitan area under the Metropolitan Area Development Law. It is equivalent to Kai Province, a province of Japan.


Surrounded by mountains over 2,000 m to 3,000 m above sea level, such as Mt. Fuji in the south, the Akaishi Mountains (Southern Alps) in the west, Yatsugatake in the north, and the Okuchichibu Mountains in the east. It is one of the few inland prefectures in Japan, an island country, that does not face the sea at all. Yamanashi Prefecture has the 32nd largest area in Japan, but since mountainous areas occupy 80% of it, the area of ​​habitable land is 45th in the whole country. The surrounding areas are exchanges with Tokyo (excluding islands), which is relatively easy to come and go and has well-developed transportation routes, Tsukui district in Kanagawa prefecture, Chu / Nanshin region in Nagano prefecture, and east of Oi river in Shizuoka prefecture. However, it has been popular since ancient times. In addition, the border with the Chichibu region of Saitama Prefecture is separated by the Okuchichibu Mountains, but with the opening of the Karisaka Tunnel on National Highway No. 140 in 1998 (1998), not only traversing the mountainous areas but also direct traffic by car or bus. Is now possible. The prefecture name of "Yamanashi" is derived from "Yamanashi-gun", which is one of the four Kai provinces under the Ritsuryo system. After that, the name was changed to "Yamanashi Prefecture". Yamanashi-gun is a county area to which Kofu, where the prefectural office is located, belongs, but the reason for changing the name of the prefecture is unknown, and it is possible that the new Meiji government intended to disconnect it from the Shogunate era. Since "Yamanashi-gun" does not originally mean Kaiichikoku, the new prefecture name did not penetrate in the early Meiji era, and political groups and their institutional magazines used "Kuninaka" as a regional name to refer to the prefecture area. Used. Today, "Yamanashi" has become established as a name that refers to the entire prefecture.

Geography / Region

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Basin: Kofu Basin Mountains: Akaishi Mountains, Minobu Mountains, Okuchichibu Mountains, Tenshi Mountains, Tanzawa Mountains, Kanto Mountains, Misaka Mountains Mountains: Mt. Fuji, Mt. Kita, Mt. Kaikoma, Mt. Yatsugatake, Mt. Kayagatake, Mt. Minobu, Mt. Kinpu, Mt. Kobushi, Mt. Daibosatsu Hills: Sone Hills, Nanariiwa Rivers: Fuji River, Kamanashi River, Fuefuki River, Hayakawa, Katsura River, Doshi River, Taba River, Arakawa Lakes: Lake Shoji, Lake Motosu, Lake Yamanaka, Lake Kawaguchi, Lake Saiko, Lake Shibire, Lake Chiyoda Pass: Gansaka Pass, Obosatsu Pass, Sasako Pass, Kagosaka Pass, Yanagisawa Pass, Misaka Pass, Yashajin Pass, Shinshu Pass Yamanashi Prefecture has steep terrain, and there are many fragile sandy soil deposits with weathered granite. In addition, how to control water was an issue for political leaders. It is due to this historical characteristic that there are many hydraulic remains called Shingen embankments in various parts of the prefecture.

Natural Park

National park Fuji Hakone Izu National Park, Chichibu Tama Kai National Park, Southern Alps National Park Quasi-national park Yatsugatake Nakanobu Kogen National Monument Prefectural Natural Park Shibireko Prefectural Natural Park, Southern Alps Koma Prefectural Natural Park

Climate and Flora

It has a Central Highland climate, but there are large regional differences separated by mountains. In the basin, the heat of summer is remarkable, but in winter it is relatively warm considering the latitude and altitude, and although the morning and evening chills are severe, the daytime temperature tends to rise due to the many sunny days. This is because the surrounding high-altitude mountain ranges often block the cold air from the north and west, and as with the Kanto Plain, the inflow of cold air tends to be delayed. In particular, the maximum temperature tends to be high throughout the year, and all summer days (25 degrees or higher) are recorded in southern towns except January. The winter monsoon (grated Yatsugatake) is strong, but snowfall is slight except for the heavy snowfall areas of Minami Alps (formerly Ashiyasu Village) and Hayakawa Town. Also, in summer, for the altitude