Mount Fuji is Japan's tallest mountain at 3,776 meters (12,389 feet) and an active stratovolcano on Honshu island, roughly 100 kilometers southwest of Tokyo. Its near-perfect conical shape, formed by repeated eruptions over the past 100,000 years, has made it Japan's most recognizable natural landmark and, since 2013, a UNESCO World Heritage Cultural Site honored for its deep influence on Japanese art, religion, and identity.
Though Fuji has not erupted since 1707, volcanologists firmly classify it as active. It sits at the rare meeting point of three tectonic plates and looms over one of the most densely populated regions on Earth, blending serene beauty with genuine geological power. This guide covers Fuji's formation, eruption record, present-day risks, and the cultural reverence that has surrounded it for more than a thousand years.
Where Is Mount Fuji?
Mount Fuji rises on the Pacific coast of Japan's main island of Honshu, straddling the border between Shizuoka and Yamanashi prefectures. It stands about 100 kilometers southwest of Tokyo, close enough that on clear days the cone is visible from the capital's skyscrapers. The mountain anchors the Fuji-Hakone-Izu National Park and is encircled by the famous Fuji Five Lakes (Fujigoko), formed when ancient lava flows dammed local rivers.
This setting places Fuji at the heart of the Greater Tokyo Area, the most populous metropolitan region in the world, with roughly 38 million residents living within reach of the volcano's potential ash fall.
Geology and Formation
- Type: Stratovolcano (composite)
- Height: 3,776 m (12,389 ft)
- Base Diameter: ~50 km
- Age: ~100,000 years
Mount Fuji sits at the junction of three tectonic plates: the Eurasian, Philippine Sea, and North American plates. This unusual triple junction subjects the region to intense geological stress and frequent earthquakes, providing the magma supply that built the volcano.
As a stratovolcano, Fuji is constructed from alternating layers of basaltic lava flows and volcanic ash, deposited over tens of thousands of years. The symmetrical cone visible today, known as "Young Fuji," was built over the past roughly 10,000 years atop the older "Old Fuji" volcano, which in turn rests on even earlier volcanic remains. This stacking of successive volcanoes helps explain Fuji's remarkably even profile. A summit crater about 500 meters in diameter marks the active vent at the peak.
Eruption History
- Known Eruptions: ~17 in recorded history
- Last Eruption: December 1707 (Hoei eruption)
- Ash Reach: Ash fell on Tokyo (then Edo), 100 km away
The 1707 Hoei eruption was Fuji's most recent and one of its most violent. It began just 49 days after a massive magnitude 8.6 earthquake struck the region, and it lasted about 16 days, opening a new crater on the southeastern flank. Volcanic ash drifted across Edo (modern Tokyo) some 100 kilometers away, darkening the sky and damaging farmland for years afterward.
Before 1707, Fuji erupted far more frequently. The Heian period (794-1185 AD) alone saw roughly ten recorded eruptions. The 864 Jogan eruption was especially significant: its extensive lava flows dammed rivers, created several of the Fuji Five Lakes, and gave rise to the dense Aokigahara forest at the volcano's base. This record of repeated activity is central to why scientists treat Fuji as a sleeping rather than extinct volcano.
Current Status and Hazards
- Classification: Active volcano
- Last Earthquake Swarm: 2000-2001
- Hazard Zone: Includes parts of three prefectures
Although Fuji has been quiet for more than 300 years, that silence does not mean it is finished. A low-frequency earthquake swarm beneath the mountain in 2000-2001 prompted renewed study, and a 2004 assessment indicated that Fuji's magma chamber remains under pressure, raising the possibility that a future eruption could begin with relatively little warning.
A major eruption today would pose serious challenges. Modeling by Japanese authorities suggests ash could blanket Tokyo, grinding transportation to a halt, fouling water supplies, and disrupting power grids and electronics across the metropolitan region. In response, the government maintains detailed hazard maps and evacuation plans for the communities in Shizuoka, Yamanashi, and Kanagawa prefectures that lie within the danger zone.
Climbing Mount Fuji
Each year about 300,000 people climb Mount Fuji, the overwhelming majority during the official season that runs from early July to early September, when the trails are free of snow and mountain huts are open. Four main routes lead to the summit, with the Yoshida Trail on the northern side being the most popular and best served by transport and facilities.
Most climbers begin at the Fifth Station, roughly halfway up by elevation, and many time their ascent to reach the crater rim at dawn to witness "Goraiko," the sunrise viewed from the summit. Despite Fuji's gentle reputation, altitude sickness, sudden weather changes, and cold are real risks, and authorities urge climbers to pace themselves and carry proper gear.
Cultural and Religious Significance
- UNESCO: World Heritage Site (Cultural, 2013)
- Climbers: ~300,000 per year
- Shinto: Sacred mountain with shrines at summit
Fuji has been venerated in Shinto and Buddhist traditions for centuries. The Sengen (Asama) shrines at the mountain's base and summit are dedicated to the goddess Konohanasakuya-hime, a deity associated with volcanoes and blossoms. Organized pilgrimages to the summit date back at least to the 12th century and gave rise to devotional groups known as Fuji-ko during the Edo period.
The mountain has inspired some of Japan's most celebrated art, above all Katsushika Hokusai's woodblock series "Thirty-six Views of Mount Fuji" and the prints of Utagawa Hiroshige. When UNESCO inscribed Fuji in 2013, it did so as a Cultural Site, recognizing the volcano not merely for its scenery but as a "sacred place and source of artistic inspiration" woven into Japanese identity. You can explore more of the country's geography and landmarks in our Japan country guide.
Key Facts
- Height: 3,776 meters (12,389 ft), Japan's highest peak
- Location: Honshu island, ~100 km southwest of Tokyo
- Volcano type: Active stratovolcano at a three-plate tectonic junction
- Last eruption: The 1707 Hoei eruption, which dusted Tokyo with ash
- Climbers: About 300,000 per year, mostly July-September
- UNESCO status: World Heritage Cultural Site since 2013
- Setting: Surrounded by the Fuji Five Lakes within a national park
Frequently Asked Questions
Is Mount Fuji still an active volcano?
Yes. Despite not erupting since 1707, Mount Fuji is classified as an active volcano. Its magma chamber remains pressurized, and an earthquake swarm in 2000-2001 confirmed it is still geologically alive rather than extinct.
When did Mount Fuji last erupt?
Fuji's last eruption was the Hoei eruption of December 1707. It lasted about 16 days, opened a new crater on the southeastern flank, and spread ash as far as Edo (modern Tokyo), roughly 100 kilometers away.
How tall is Mount Fuji and can you climb it?
Mount Fuji is 3,776 meters (12,389 feet) tall, the highest mountain in Japan. It can be climbed, and about 300,000 people make the ascent each year, almost all during the official climbing season from early July to early September.
Why is Mount Fuji a UNESCO World Heritage Site?
Fuji was inscribed in 2013 as a Cultural rather than Natural site. UNESCO recognized its centuries-long role as a sacred mountain in Shinto and Buddhist worship and its powerful influence on Japanese art, including Hokusai's famous prints.