Gunung Rinjani on Lombok: a high volcanic caldera world
Published on 09/15/2026 at 20:21 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Gunung Rinjani on Lombok in Indonesia is an active stratovolcano whose high ridges, wide caldera and crater lake define the northern skyline of the island. Rising to about 3,726 m (12,224 ft) above sea level, it is recognised as one of Indonesia’s tallest volcanoes and forms the core of a national park and biosphere reserve focused on volcanic landscapes and mountain forests.Rising to 3,726 m
Gunung Rinjani’s high summit ridge and caldera
Gunung Rinjani is a large stratovolcano occupying the northern part of Lombok, part of the Lesser Sunda Islands in Indonesia.The stratovolcano is located on Lombok The mountain reaches 3,726 m (12,224 ft), making it the second-highest volcano in Indonesia after Kerinci in Sumatra.The highest peak is Mount Rinjani, the second-highest volcanic mountain in Indonesia The summit ridge forms an elongated crest with steep volcanic flanks dropping into deep valleys that carry drainage towards Lombok’s coastal plains.
The upper part of Gunung Rinjani is dominated by a wide caldera that opens towards the west and contains the crater lake Segara Anak and younger volcanic cones.It is famous for its 6 x 8.5 km wide caldera The caldera floor lies high above sea level, surrounded by cliffs and broken ridges that give views over the interior lake and the surrounding Lesser Sunda Islands when conditions are clear.
Segara Anak and the younger cones within the crater
Inside the caldera of Gunung Rinjani lies Segara Anak, a volcanic lake set well above 2,000 m (6,562 ft) with a surface area of around 11 square kilometres and a maximum depth reaching about 230 m (750 ft).The lake spans across an area of 11 square kilometers, and reaches depths up to 230 meters The lake’s blue colour and steep surrounding walls make it a striking sight from the crater rim and from the shore.
On the floor of the caldera, younger volcanic cones have formed inside and near Segara Anak, including Barujari, which has produced moderate explosive eruptions and lava flows recorded from the nineteenth century into the twenty-first century.Barujari cone emerged there and has been the site of moderate explosive activity and lava flows Activity from these cones has reshaped parts of the lake shore and caldera floor, leaving fresh volcanic surfaces alongside older, weathered slopes.
Protected status, forests and trekking routes
Gunung Rinjani and its surrounding landscapes form Gunung Rinjani National Park on Lombok, which is part of the Rinjani Lombok biosphere reserve recognised under UNESCO’s Man and the Biosphere Programme.Rinjani Lombok is a biosphere reserve that includes Lombok Island The protected area covers coastal zones, lower hills and high mountain terrain, with forest types ranging from lowland rain forest to montane forest and areas of savannah-like vegetation.
The slopes and ridges of Gunung Rinjani are reached by established trekking routes that climb through villages, cultivated land and forest towards the crater rim and summit area.Mount Rinjani is an active volcano and a national park in Lombok Paths on the higher flanks cross loose volcanic ash and rocky sections, and the elevation gain brings cooler air and thinner vegetation compared with the coastal parts of Lombok.
Visiting Gunung Rinjani: what travellers from Western Europe should know
- Gunung Rinjani rises in northern Lombok, Indonesia, and is reached from towns such as Senaru and Sembalun by road, followed by trekking routes that climb onto its flanks.
- The mountain involves sustained ascents on steep paths across volcanic ash, rock and exposed ridges, with high elevations above 3,000 m (9,843 ft) that demand steady pacing and suitable clothing.
- Gunung Rinjani’s caldera and summit sit within a national park in Indonesia; the official language is Indonesian and the currency is the Indonesian rupiah.
- Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.
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Frequently asked questions about Gunung Rinjani
Where is Gunung Rinjani located?
Gunung Rinjani is on the island of Lombok in Indonesia, forming the dominant mountain mass in the island’s northern region within a designated national park.
What should travellers expect on a visit to Gunung Rinjani?
Travellers encounter long ascents on volcanic paths, cooler temperatures at higher elevations and expansive views over Segara Anak and the surrounding Lesser Sunda Islands from the crater rim.
What makes Gunung Rinjani distinctive among Indonesian mountains?
Gunung Rinjani combines a high summit ridge, a large caldera with Segara Anak crater lake and active cones such as Barujari, all protected within a biosphere reserve on Lombok.
