Mount Yoko (横岳, Yoko-dake) is located in the Southern Yatsugatake Volcanic Group of the Yatsugatake Mountains, Honshū, Japan.
| Mount Yoko | |
|---|---|
| 横岳 | |
 | |
| Highest point | |
| Elevation | 2,829 m (9,281 ft) |
| Prominence | 140 m (460 ft) |
| Parent peak | Mount Aka |
| Listing | List of mountains and hills of Japan by height |
| Coordinates | 35°58′59″N 138°22′27″E / 35.98306°N 138.37417°E |
| Naming | |
| Language of name | Japanese |
| Geography | |
| Parent range | Southern Yatsugatake Volcanic Group |
| Topo map(s) | Geographical Survey Institute 25000:1 八ヶ岳西部, 25000:1 八ヶ岳東部, 50000:1 八ヶ岳 |
| Geology | |
| Rock age | Quaternary |
| Mountain type | Volcanic |
| Volcanic arc/belt | Northeastern Japan Arc |
