Gunung Semeru

Gunung Semeru is an active stratovolcano on the island of Java and the highest peak on Java, with a summit elevation of 3,676 meters. It is located within Bromo Tengger Semeru National Park and is one of Indonesia’s best-known volcanoes.

Popular for challenging alpine trekking rather than casual sightseeing, the standard route is a multi-day hike that passes the volcanic lake Ranu Kumbolo at about 2,400 meters and the Oro-oro Ombo grassland before the final ascent to the summit. Trekkers go for the high-altitude views and the summit experience rather than built attractions; the route is rugged and exposed in places.

Semeru is an active volcano with frequent eruptive activity recorded in the modern era; its persistent activity shapes the landscape and is a safety consideration for visitors. Local park authorities and Indonesian volcanological agencies monitor conditions and issue warnings when necessary.

The mountain sits in East Java inside Bromo Tengger Semeru National Park, on the border area of Java’s highlands. The main trailhead used by most climbers is at Ranu Pani, which serves as the gateway village for most ascents.

• Elevation: The mountain's summit elevation is 3,676 meters, making it the highest peak on Java.
• Typical trek: Climbs are most commonly done as multi-day treks from the trailhead at Ranu Pani, with typical itineraries of 2 to 3 days depending on pace and route.

What to See #

• Ranu Kumbolo: A high-altitude volcanic lake on the southern approach to the summit, sitting at about 2,400 meters and commonly used as an overnight campsite on the standard Ranu Pani-Ranu Kumbolo-Mahameru trekking route.
• Mahameru (summit): The summit cone, locally called Mahameru, reaching 3,676 meters above sea level and forming the highest point on the island of Java.
• Oro-oro Ombo (savanna): A broad open grassland above the forest line known as Oro-oro Ombo that appears on the main ascent route and is a notable landscape feature on the mountain's slopes.