197 Eruptions — and Almost All of Them Gentle
Run the numbers across our whole Holocene database and Piton de la Fournaise comes out on top for one specific thing: confirmed eruption count. It has 197 — more than Etna (147), more than Kilauea, more than any other volcano we track — and it leads both all-time and in the modern era, with about 101 confirmed eruptions since 1900. That's the headline our most active volcanoes ranking is built on.
Here's the twist that makes it interesting. All that activity is almost entirely harmless. Of the 188 eruptions with a VEI assigned in our record, 187 are VEI 2 or smaller— short, effusive outpourings of runny basaltic lava with no explosive column to speak of. Exactly one, a caldera-forming event around 2765 BCE, reached VEI 5. So the most frequently erupting volcano on the planet is also, measured eruption by eruption, one of the least explosive. That combination doesn't happen by accident.
Why It Erupts So Often
Two things make Piton de la Fournaise a near-annual erupter. First, it's a hotspot volcano: it sits over the Réunion mantle plume, a fixed deep source that feeds it a steady supply of magma — the same kind of plumbing that makes Hawaii's shields so productive. Second, that magma is basalt: hot, low in silica, and low in gas, so it flows rather than explodes.
That's the recipe for a shield volcano — a broad, gently sloping dome built from thousands of thin lava flows stacked over time, rather than the steep, violent cone of a stratovolcano. And there's a geographic bonus: most eruptions happen inside the Enclos Fouqué, a horseshoe-shaped caldera open to the sea on the volcano's southeast side. Its walls funnel lava down toward an uninhabited coast, which is why Réunion can host the world's busiest volcano and still rarely lose a building to it.
The Record: 5,000 Years of Lava
Our confirmed record stretches back to around 2795 BCE. The modern pattern is relentless and repetitive — a short effusive eruption, a pause of months to a couple of years, then another. These four recent eruptions are the ordinary rhythm; the fifth row is the one exception in the entire record.
| Eruption | VEI | Style | What happened |
|---|---|---|---|
| 2023 CE | 0 | Effusive fissure | The most recent eruption in our GVP record — a short outpouring of basaltic lava inside the uninhabited Enclos Fouqué caldera. No explosivity, no damage. |
| 2021 CE | 0 | Effusive fissure | Two eruptions in the year, both basaltic lava flows confined to the caldera — the volcano's ordinary mode. |
| 2020 CE | 0 | Effusive fissure | Two more effusive eruptions, continuing the near-annual rhythm. |
| 2019 CE | 0 | Effusive fissure | Two eruptions. Lava poured down the Grandes Pentes but stayed within the enclosed caldera, as it almost always does. |
| ~2765 BCE | 5 | Caldera-forming | The single large eruption in the entire Holocene record — the lone exception to roughly 5,000 years of gentle effusion. Associated with the collapse that helped shape the Enclos Fouqué. |
Source: VolcanoDB analysis of Smithsonian Global Volcanism Program records for Piton de la Fournaise (197 confirmed eruptions; 84 rated VEI 0, 16 VEI 1, 87 VEI 2, one VEI 5). See the full data page and our eruption timeline.
The One Time It Wasn't Gentle
A single eruption breaks the pattern. Around 2765 BCE Piton de la Fournaise produced a VEI 5 eruption — a thousand times larger than its typical VEI 0–2 events — tied to the caldera collapses that built the stepped landscape of the Enclos today. It's a reminder that even a textbook effusive shield can, very rarely, do something violent. But “very rarely” is doing real work here: that's one explosive eruption in roughly five millennia of near-continuous activity. The base rate for a dangerous day at Piton de la Fournaise is about as low as an active volcano gets.
“Most Active” Is Not “Most Dangerous”
It's worth being precise, because the words get blurred. Our most active ranking counts how often a volcano erupts. Our most explosive ranking counts how hard. Our most dangerous list is about who it can kill. Piton de la Fournaise tops the first and sits near the bottom of the other two — the opposite profile to a volcano like Whakaari, which erupts small but has killed because people stand on it. High frequency plus low explosivity plus an uninhabited exit path for the lava is the safest combination there is — and it's exactly why Réunion treats its volcano as a spectacle, not a threat.
Recent Activity and Current Status
After its 2023 eruptions, Piton de la Fournaise went unusually quiet. It broke that repose on 18 January 2026 with a new effusive eruption inside the Enclos Fouqué — its first since August 2023 — reported by The Watchers. Through September 2026 the OVPF-IPGPobservatory noted renewed seismicity beneath the summit from about 17 September and persistent summit inflation — signs that magma is re-pressurising at shallow depth beneath the cone. As the observatory puts it, no scenario is ruled out: a fresh eruption at the summit, one on a flank, or a prolonged pause. If you're planning a visit, the OVPF bulletin and the Réunion prefecture's alert phase are the sources that decide whether the trail is open.
Hiking Piton de la Fournaise
When it's quiet, Piton de la Fournaise is one of the great volcano hikes on Earth — and genuinely accessible, which many famous volcanoes aren't. The classic route starts at the Pas de Bellecombe viewpoint on the caldera rim, drops down a staircase onto the Enclos floor, and crosses a raw plain of recent black lava to the Dolomieu summit crater — a long but non-technical full-day return walk. Most visitors reach the trailhead by car across the lunar Plaine des Sables; guided half- and full-day trips from across Réunion handle the logistics and read the weather, which turns fast at 2,600 metres. Access shuts whenever the alert is raised, so book flexibly.