Gunung Arjuno

Information

Elevation

3.339 m

Country

Indonesia (ID)

Location / Range

Arjuno-Welirang volcanic complex, East Java

Mountain type

Stratovolcano (Arjuno-Welirang volcanic complex)

Volcanic?

Yes — volcano

Coordinates

-7.7330, 112.5750

Difficulty

Difficult — a 2-day, 1-night climb; routes via Tretes, Lawang, or Purwosari; a minimum of 3 people per group; single-day round trips (tektok) are prohibited

Best Season

April–October (dry season)

Permits & Rules

eSIMAKSI is mandatory; register online via the SIPENERANG system on the official Tahura Raden Soerjo site; fee Rp25,000/person/day (Indonesians)

Hazards

Sulfur gas (H₂S/SO₂) from the Welirang Crater; hypothermia at the summit (2–5°C); branching trails prone to getting lost especially via Lawang; trail closed in extreme rainy-season weather

Description

Mount Arjuno is a dormant stratovolcano in East Java, Indonesia, reaching 3,339 meters above sea level and one of Java's highest summits. Its peak, Puncak Ogal-Agil, takes its name from a Javanese phrase describing a rock balanced precariously on a cliff's edge. The mountain forms part of the Arjuno-Welirang volcanic complex within the Tahura Raden Soerjo protected forest, approximately 50 km south of Surabaya and 20 km north of Malang. Hikers approach from multiple trailheads — Tretes to the north, Lawang to the east, and Purwosari to the west — with the dry season from April to October considered optimal. All climbers must register online through the SIPENERANG eSIMAKSI permit system, and solo hiking is prohibited (minimum group of three).