While many think of an Indonesia vacation as lounging on pristine beaches, others prefer to take advantage of the country's incredible geological formations to discover what the earth has most spectacular to offer. Make no mistake about it: Indonésie is a land of volcanoes with 400 recorded volcanoes, 70 of which remain active—enough to make any volcanologist green with envy.

The abundance of volcanoes and their distinctive characteristics offer Indonésie a wealth of rich and varied landscapes, explaining the lush nature that only this archipelago truly possesses. Here, we zoom in on the most beautiful volcanoes in Indonésie, from Java to Sumatra, passing through Bali.

Mount Batur Kintamani, Bali

Mount Batur is an active volcano in Bali renowned for its magnificent sunrise. It's highly favored by travelers and trekkers since it's possible to reach its summit and return to its base in just 4 to 7 hours. The ascent is primarily undertaken at night to arrive at the top for sunrise. Rising to 1,717 meters above sea level, Mount Batur offers an incredible panoramic view of the surrounding landscape.

Kawah Ijen, East Java

The Kawah Ijen volcano is located at the far eastern tip of the island of Java. This Indonesian volcano is well-known among volcanologists and captures the curiosity of many travelers because of its blue lava, which can be observed at night. This striking blue color is explained by the sulfurous vapors escaping from the crater and its acidic lake.

Although ascending at night can be tiring, the spectacle is no less fascinating. At Kawah Ijen, you'll encounter sulfur carriers, barefoot or in flip-flops, calmly ascending the slope with baskets on their backs.

Mount Bromo, East Java

Located on the island of Java, Mount Bromo is one of the most active volcanoes in the world, but also one of the most visited. It ranks among Indonésie's emblematic mountains for its unparalleled beauty, particularly at sunrise.

Trekkers don't attempt night hiking on Mount Bromo itself but on the surrounding peaks. The trails offered are relatively easy and are primarily undertaken at night, lit by headlamps, to witness the spectacular show that the first light of day casts over the massif, the Cemoro Lawang plateau, and the surrounding mountains.

Mount Merapi, East Java

You have the opportunity to see Mount Merapi on the island of Java, north of Yogyakarta. Rising to 2,900 meters above sea level, it ranks among the archipelago's most dangerous active volcanoes, alongside Krakatau. Merapi is also one of the favorite playgrounds for trekking enthusiasts. Indeed, the path leading to its summit is steep and grueling; but the landscapes surrounding it are majestic. Note that it takes approximately 7 hours to ascend and descend this volcano.

Mount Krakatau, West Java

Mount Krakatau is a volcanic island of Java. To be more precise about its location, it sits in the Sunda Strait, between Java and Sumatra. It is one of Indonésie's most dangerous active volcanoes. Indeed, during its eruption in 1883, it caused significant damage. That said, it's quite pleasant to climb, as it only takes 1 hour to scale and 1 hour to return to its base.

Mount Rinjani, Lombok

It is on the island of Lombok that you'll find Mount Rinjani. Rising to 3,726 meters above sea level, it is the second highest volcano in Indonésie, behind Kerinci. Climbing this mountain is quite difficult, as the path to its summit is not only long but also continuously ascending. It takes 2 days and 1 night to reach the rim of its crater (return included); and 3 days and 2 nights, or even 4 days and 3 nights, to reach its summit (return included). However, after a grueling and lengthy journey, you access fairy-tale landscapes worthy of the greatest science fiction films like Game of Thrones or The Lord of the Rings.

Mount Kerinci, Jambi, Sumatra

With an altitude of 3,805 meters, Mount Kerinci is the highest volcano in Indonésie. It ranks among the most active and most difficult volcanoes to climb. Thus, to reach its summit, you must allow for at least 2 days of hiking. Nevertheless, the adventure is worth the effort, as to reach the mountain's peak, you must traverse the jungle of the Kerinci Seblat National Park. This jungle is home to multiple wonders, including Sumatran tigers and rhinoceros. You can also discover several species of rare primates and birds.

Mount Agung, Bali

Mount Agung has been getting quite a bit of attention lately due to the heavy smoke it has been releasing for several weeks now. The Agung volcano watches over Bali from its height of 3,142 meters. The island's highest peak, Mount Agung is a truly sacred place for the local population.

Its ascent takes you through forests that are home to numerous wild animals. Several hiking trails are available, allowing you to choose the one that suits you best.

Tambora, Sumbawa Island

Located on the island of Sumbawa, Tambora is an active stratovolcano that recorded the most violent volcanic eruption ever known in 1815. The volcano rises to 2,857 meters above sea level and dominates the entire island.

To reach the volcano's still-smoking crater, the ascent will take you through lush vegetation. Departures are from the village of Pancasila.

Mount Semeru, Java

The highest volcano on the island of Java, Mount Semeru dominates at 3,676 meters. Located in the heart of Bromo Tengger National Park, Semeru ranks first among Indonésie's most active volcanoes due to its frequent small eruptions.

Good physical condition is necessary to reach the volcano's highest point. Its ascent is difficult, and the volcanic ash in the air adds to the challenge. Nevertheless, the view from the summit is incredible and rewards all the effort expended.