The Okuchichibu Mountains belong to the Kanto region and Kōshin'etsu, which is a subregion of the Chubu region.
It covers the western part of the prefectures Tokyo and Saitama, the southwestern part of Gunma, the southeastern part of Nagano and the northern part of the Yamanashi Prefecture.
The highest of it is the Mt. Kitaokusenjodake (2'601 m). Other summits higher then 2000 metres are the Mt. Kimpusan (2'599 m), Mt. Kokushi (2'591 m), Mt. Asahi (2'579 m), Mt. Kobushi (2'475 m), Mt. Tokusa (2'468 m), Mt. Ogawa (2'418 m), Mt. Kurogane (2'232 m), Mt. Mizugaki (2'230 m), Mt. Suisho (2'158 m), Mt. Goro (2'132 m), Mt. Karamatsuo (2'109 m), Mt. Hiryū (2077 m), Mt. Daibosatsurei-san (2'057m), Mt. Wanakura (2'036 m), Mt. Kentoku (2'031 m) and the Mt. Kumotori (2'017 m).
Most of the range is situated within the Chichibu-Tama-Kai National Park.
Japan 1955, Okuchuchibu.
(value 5: Tawa Gorge)
The stamps were issued perforated in sheets of 20 stamps and imperforated in the miniaturesheet Chichibu-Tama-Kai National Park.
view from the top of Mount Kumotori towards south over the Okuchichibu Mountains towards Mount Fuji in the far background.
Japan 1967, Okuchichibu Mountains (Chichibu Lake).
Japan 1967, Okuchichibu Mountains in the background (bottom).
(Japanese National Track and Field Championships, Taitama).
Japan 2007, Kakuenbou.
The Kakuenbou is dominant peak in Shosenkyo (gorge).
Japan 2013, Kakuenbou.
The stamp was issued in the sheet
"60th anniversary series of Local Government Act construction, Yamanashi Prefecture".