is a town located in the western portion of Tokyo Metropolis, Japan. , the town had an estimated population of 4,949, and a population density of 22 persons per km2. The total area of the town is . Geography 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 Odake (Tokyo) 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 Okutama has a Humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to