| Mount Usu | |
| Other Name: | 有珠山 Usu-zan |
| Elevation M: | 733 |
| Elevation Ref: | [1] |
| Listing: | Mountains of Japan |
| Range: | Nasu Volcanic Zone |
| Location: | Hokkaidō, Japan |
| Map: | Japan Hokkaido |
| Coordinates: | 42.5435°N 140.8392°W |
| Topo: | Geographical Survey Institute 25,000:1 壮瞥, 50,000:1 虻田 |
| Type: | Stratovolcano |
| Volcanic Arc/Belt: | Northeast Japan Arc |
| Last Eruption: | March 2000 to September 2001 |
| Fetchwikidata: | ALL |
is an active stratovolcano in the Shikotsu-Tōya National Park, Hokkaido, Japan. It has erupted four times since 1900: in 1910 (which created Meiji-shinzan[2]), 1944–45 (which created Shōwa-shinzan), August 7, 1977,[3] and on March 31, 2000. To the north lies Lake Tōya. Mount Usu formed on the southern rim of the caldera containing the lake.
Mount Usu and Shōwa-shinzan are major tourist attractions in the Shikotsu-Tōya National Park. A rope-way on Mount Usu takes visitors to viewing platforms overlooking Shōwa-shinzan. The 1977 eruption is mentioned in passing in Alan Booth's travelogue, The Roads to Sata. The 2008 G8 Summit was held near Mount Usu at Lake Tōya.[4]
| Tōya caldera &<br />Mount Usu (bottom)File:Mount Usu Relief Map, SRTM-1.jpg | Mount UsuFile:Lake touya and volcano usu.jpg | Tōya caldera & Usu volcanoFile:130922 Mount Usu Sobetsu Hokkaido Japan09bs5.jpg | Mountaintop CraterFile:130922 Mount Usu Sobetsu Hokkaido Japan01s5.jpg | East side |