Okutama is located in the Okutama Mountains of far western Tokyo. It is geographically the largest municipality in Tokyo. Mount Kumotori, Tokyo's highest peak at 2017 m, divides Okutama from the Okuchichibu region of the neighboring Saitama and Yamanashi Prefectures. Tokyo's northernmost and westernmost points lie in Okutama, as does Lake Okutama, an important source of water for Tokyo, situated above the Ogōchi Dam in the town.
Mountains
Mount Kumotori
:Mount Kumotori, at 2017 m is the highest mountain in Tokyo and the westernmost place of Tokyo. Many plants grow here during the summer, most notably the tsuga. From the summit, there is a clear view of Mount Fuji and the Okuchichibu Mountains.
Mount Mitō
:Because it was forbidden to enter Mount Mitō during the Edo period, there are still many forests of enormous beech trees. Mount Fuji and Mount Kumotori can be seen from the summit, and it attracts many visitors especially during autumn. It is one of the Three Mountains of Okutama.
Mount Ōdake
:Mount Ōdake is one of the Three Mountains of Okutama. From the summit at 1266 m, Mount Fuji can be seen to the south and Mount Gozen to the west.
Mount Kawanori
:From Mount Kawanori, all mountains in Okutama can be seen. Also, the Hyakuhiro Waterfall is located here.
Mount Gozen
:Mount Gozen is well known for its oddly perfectly triangular shape. Like Mount Mitō, it attracts visitors in the fall.
Rivers
Tama River
:The Tama River, with a length of 138 km, is the longest river in the prefecture. It flows through the entire prefecture, and the upstream of the river is located in Okutama.
Hinohara River
:The Hinohara River is a rather short and small river located in the western portion of Tokyo.
Lakes
Lake Okutama
Lake Shiromaru
:Lake Shiromaru is a rather infamous dam on the Tama River. It has a height of 30.3 m, a length of 61 m, and a volume of 14,161 m3.
Surrounding municipalities
Tokyo Metropolis
*Akiruno
*Ōme
*Hinohara
Saitama Prefecture
*Chichibu
*Hannō
Yamanashi Prefecture
*Uenohara
*Kosuge
*Tabayama
Climate
History
Prehistory
People began settling in Okutama from before the Jōmon Period and many archaeological sites have been found with ancient pottery. During the Yayoi period, rice cultivation began in the flatter lands of present-day Okutama, but most of the area remained covered by forests and only small flat lands existed.
Premodern period
During the Edo period, the area included in present-day Okutama was divided into 16 villages within Musashi Province. In each village, there was one person who served as the mayor, another who served as the leader of a particular group, and another who served as a representative for the farmers. Also, entering Mount Takanosu was forbidden for people of low rank during this time. This was because the people of high rank hunted with hawks at the mountain, and the officials wanted to keep the hunting grounds for themselves.
Modern Times
With the start of the Meiji period, the area of Okutama became part of Nirayama Prefecture except for Kotaba village, which was merged into Maebashi Domain, which then became part of Gunma Prefecture. While Kotaba village was turned into part of Maebashi city, the Okutama area was divided into three villages of Hikawa, Kori, and Ogouchi with the establishment of the municipalities system on April 1, 1889. In 1940, Hikawa was elevated to town status. In 1955, Hikawa town, Ogouchi village and Kori village were united, forming the town of Okutama.
Economy
Seasonal tourism, forestry and charcoal production are mainstays of the local economy.
Education
Okutama has two elementary and two middle schools. The town does not have a high school.
:Lake Okutama plays a major role in providing drinking waterfor the people of Tokyo. The largest lake in Tokyo, it also has a large dam.
Mount Takanosu
:During the Edo Period, the people of low rank were forbidden to enter Mount Takanosu, because it was a hawk hunting ground for the government and military officials. Now, it is open to hikers, and has an elevation of 1736.6 m.
Tsurunoyu Onsen
:Until the construction of Ogouchi Dam, there was a spa town for Tsurunoyu Onsen. Now, there are a few inns that use the hot water from the hot spring for their spas. The hot spring is located about 20 minutes by bus from Oku-Tama Station.
Hyakuhiro Waterfall
:Hyakuhiro Waterfall, with a height of 40 m, is a famous waterfall in the Okutama area. Located in Mount Kawanori, it is part of the Nippara River.
Nippara Cave
:Nippara Cave is the second largest limestone cave in the Kantō region after the Fujido Cave in Gunma Prefecture, and attracts many visitors from around Japan.
