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Mount Asama
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Mountain
Mount Asama is an active complex volcano situated on the border between Gunma and Nagano prefectures on the Japanese island of Honshu. Standing at an elevation of 2,568 meters, it is a triple-strato volcano composed of several overlapping volcanic cones. The volcano is historically significant for its numerous eruptions, most notably the devastating Tenmei eruption of 1783, which caused widespread famine and significant loss of life across the region. Asama is classified as one of Japan's most active volcanoes and is monitored extensively by the Japan Meteorological Agency due to its proximity to populated areas and its frequent seismic activity. The surrounding landscape, including the Onioshidashi volcanic rock park, was dramatically reshaped by cooling lava flows from past events. Today, it remains a focal point for geological research and a popular destination for hikers, although access to the crater is often restricted depending on current volcanic alert levels. Its prominent peak is a landmark of the Karuizawa region.
- Location: Japan
- Top sights: Mt. Gippa · Mt. Asama · Mt. Maekake
- Nearby: Karuizawa (10 km)
Best time to visit & climate
The most pleasant time to visit is Jun–Aug.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg °C | -5 | -4 | 0 | 6 | 12 | 16 | 20 | 21 | 17 | 11 | 4 | -2 |
| Rain mm | 83 | 60 | 83 | 88 | 103 | 143 | 199 | 162 | 178 | 159 | 87 | 90 |
📋 Practical info
Getting there
Reaching Mount Asama (mountain) in Japan typically involves traveling to the nearest town and continuing via local transport. The approach uses main roads, then unpaved paths.
Best season
The best time to visit this mountain is during the region's stable weather season for safer conditions. Always check local climate as weather can change rapidly here.
Terrain & paths
The terrain around Mount Asama consists of natural, uneven ground. Pathways may be informal or completely absent, requiring a good sense of balance and physical readiness.
What to bring
Proper footwear with grip is essential for exploring this mountain. Carrying sufficient water, sun protection, and versatile clothing layers is highly recommended here.
Parking
Dedicated parking near Mount Asama is usually very limited. Visitors typically park vehicles at a nearby settlement and proceed on foot or by local transportation means.
Safety
Safety at this mountain relies on personal responsibility. Staying on any visible paths, observing weather shifts, and avoiding excessive risks are crucial guidelines.
Time needed
A typical visit to explore the immediate surroundings usually requires at least half a day. More extensive trekking needs a full day or potentially an overnight stay.
Geography
Facts
- Mount Asama reaches an elevation of 2,568 meters and is one of the most active volcanoes on Honshu island.
- The catastrophic Tenmei eruption of 1783 lasted for over three months and caused widespread destruction.
- The volcano is located approximately 140 kilometers northwest of Tokyo and is monitored 24/7 by the JMA.
- It is classified as a triple-strato volcano, consisting of three overlapping volcanic structures.
- The Onioshidashi Park was formed by a massive lava flow during the major eruption event of 1783.
- Japan's first modern seismological observatory was established at the base of Mount Asama in 1911.
Explore nearby
Notable places around
Route planner — Car & Motorhome
Where do you start? We build the route here, with stops and country notes along the way.
Vehicle
Only stops with (optional):
© OpenStreetMap contributors · OpenRouteService
Sights in the town Mount Asama (6)
Sights nearby
Frequently asked questions
How active is Mount Asama?
It is one of Honshu's most active volcanoes. Access to the summit crater is usually restricted due to volcanic activity.
What is the Onioshidashi Park?
A lava park at the mountain's base featuring unique rock formations created during the massive 1783 eruption.
Can you hike on Mount Asama?
Yes, trails lead to the rim of the outer crater (Kurofu-yama), offering great views of the smoking main cone.
Is Mount Asama near Tokyo?
It is located about 150 km northwest of Tokyo, near the famous resort town of Karuizawa.
When should you visit the volcano?
Autumn (October-November) is well-suited for experiencing the spirited fall colors in the surrounding forests.
Mount Asama: where is it located?
Mount Asama is located in Japan.
Mount Asama: what is there to see?
Highlights include Mt. Gippa, Mt. Asama, Mt. Maekake.
Mount Asama: when is the best time to visit?
The most pleasant time to visit is Jun, Aug.
Mount Asama: why is it worth visiting?
Mount Asama is an active complex volcano situated on the border between Gunma and Nagano prefectures on the Japanese island of Honshu.
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