Ōu Mountains
Mountain range in Honshu, Japan
title: "Ōu Mountains" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["mountain-ranges-of-akita-prefecture", "mountain-ranges-of-aomori-prefecture", "mountain-ranges-of-iwate-prefecture", "mountain-ranges-of-miyagi-prefecture", "mountain-ranges-of-yamagata-prefecture", "mountain-ranges-of-fukushima-prefecture"] description: "Mountain range in Honshu, Japan" topic_path: "general/mountain-ranges-of-akita-prefecture" source: "https://en.wikipedia.org/wiki/Ōu_Mountains" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Mountain range in Honshu, Japan ::
::data[format=table title="Infobox mountain"]
| Field | Value |
|---|---|
| name | Ōu Mountains |
| native_name | |
| photo | Ou mountains koriyama.jpg |
| photo_caption | A section of the Ōu Mountains near Kōriyama, Fukushima |
| country | Japan |
| subdivision1_type | States |
| subdivision1 | |
| subdivision2_type | Region |
| subdivision2 | Tōhoku |
| highest | Mount Iwate |
| highest_location | Iwate Prefecture |
| elevation_m | 2038 |
| range_coordinates | |
| length_km | 500 |
| length_orientation | North-South |
| width_km | 35 |
| width_orientation | East-West |
| geology | Volcanic |
| orogeny | Island arc |
| :: |
| date = April 2019 | name = Ōu Mountains | native_name = | other_name = | etymology = | photo = Ou mountains koriyama.jpg | photo_caption = A section of the Ōu Mountains near Kōriyama, Fukushima | country = Japan | subdivision1_type = States | subdivision1 = | subdivision2_type = Region | subdivision2 = Tōhoku | highest = Mount Iwate | highest_location = Iwate Prefecture | elevation_m = 2038 | range_coordinates = | coordinates = | length_km = 500 | length_orientation = North-South | width_km = 35 | width_orientation = East-West | area_km2 = | geology = Volcanic | orogeny = Island arc | map = | map_caption =
The Ōu Mountains are a mountain range in the Tōhoku region of Honshū, Japan. It is the longest range in Japan and stretches 500 km south from the Natsudomari Peninsula of Aomori Prefecture to the Nasu volcanoes at the northern boundary of the Kantō region. Though long, the range is only about 35 km wide. The highest point in the range is Mount Iwate, 2038 m.
The range includes several widely known mountains: Hakkōda Mountains, Mount Iwate, Mount Zaō, Mount Azuma, Mount Yakeishi, and Mount Adatara.
Naming
These mountains previously formed the boundary between historical provinces of Mutsu (陸奥国) and Dewa (出羽国). The kanji for the name of the mountain range was created from one kanji of the two provinces, 奥 and 羽, respectively.
Geology
The Ōu Mountains began to form in the Pliocene. They sit over the middle of the inner arc of the Northeastern Japan Arc. This is the result of the Pacific plate subducting under the Okhotsk plate. A chain of Quaternary volcanoes along the range forms the volcanic front.
References
References
- Hirotoshi Nishiwaki. "Northeastern Honshu". GLGArcs.
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