Mount Karthala at a glance
Mount Karthala is the big volcano of Grande Comore (Ngazidja), an active shield volcano in the south of the island. Its summit holds a wide caldera. Published heights differ: the Smithsonian Global Volcanism Program gives 2,350 m, while the Comorian tourism office and France give 2,361 m. Both figures are shown side by side here.
For many visitors this is the most striking outing in the country. It is also the most demanding, with a need for fitness, proper mountain gear and a guide who knows the terrain.
Our take: Karthala with a guide
This 8-hour guided hike is the only Karthala option we list.
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Guided Mount Karthala hike
A day on Grande Comore's volcano with a local guide, hotel pickup and drop-off included.
Karthala volcano: eruptions and activity
Volcano records list eruptions in April and November 2005 and in January 2007, the last known. A report of glowing in 2012 is not presented as a new eruption. Seismic activity picked up again in 2022, which France mentions in its travel advice; it was not an eruption.
A long quiet spell does not make the mountain safe. There is no current alert level and no confirmation that the mountain is open to visitors, so ask your guide and your embassy just before you leave.
The photo beside this text shows an old crater lake on Grande Comore, not the summit caldera of Karthala.
Hiking Mount Karthala: time and route
Two formats exist, with different lengths.
A local operator describes a climb on foot from Mvouni. The plan allows three hours to the camp and two more to the crater, with a return to Moroni around 6 pm for a 12-hour day. That is this operator's own schedule and it depends on the fitness of participants. It does not guarantee that every group reaches the crater in a day.
The guided hike featured on this page is listed at 8 hours, with a local guide and hotel pickup. The two figures cannot be compared, because they describe two different products. Either way, start early and keep time in reserve.
Safety on the volcano
The points raised in official travel advice.
An experienced guide
France recommends going with an experienced guide and mountain equipment. No legal guide requirement or permit was found, so this is advice rather than a rule.
Is Comoros safe? →CO2 and explosions
Carbon dioxide and so-called phreatic explosions are named among the risks near the summit.
Things to do →No camping in the caldera
France strongly advises against camping inside the caldera. Do not rely on an improvised camp either.
Comoros tours →Weather and season
The wet season runs from November to May, and cyclones are possible from January to May.
Best time to visit →No reliable information exists on the cost of any permit, drinking water points, accommodation at the crater or authorised campsites, so ask your guide. To place the volcano on the map, see the Grande Comore page.
Mount Karthala: frequently asked questions
Is Mount Karthala an active volcano?
Yes, it is an active shield volcano. Its last known eruption was in 2007, and the seismic activity of 2022 was not an eruption.
How high is Mount Karthala?
Two values are published: 2,350 m by the Smithsonian and 2,361 m by the Comorian tourism office and France.
How long does the Karthala hike take?
It depends on the format. A local operator describes a 12-hour day from Mvouni, and the guided hike offered here is listed at 8 hours.
Do I need a guide for Mount Karthala?
France recommends an experienced guide. No legal guide requirement or permit was found.
Can I camp in the Karthala crater?
No. France strongly advises against camping in the caldera.