Conquering the Ijen Volcano on the island of Java

Ijen is an active volcano on the island of Java in Indonesia. But you won’t find lava in the center of the volcano: instead, the largest acid lake in the world is in the crater. Despite the fact that the volcano constantly spews sulfur vapor, the turquoise lake is filled with a mixture of sulfuric and hydrochloric acids, and being a miner in the area is considered the most dangerous job in the world, Ijen attracts countless tourists every day. Climbing the volcano starts late at night so that tourists have time to see the blue flames, or, simply put, sulfur vapor, which glows in the dark when oxidized. We tell you how to conquer this place.

When to Go 

Ijen can be climbed at any time of the year, the exceptions being bad natural conditions or eruptions of neighboring volcanoes. Ijen is also an active volcano, but the last time it erupted was more than 20 years ago. The volcano’s activity indicators are monitored daily by volcanologists, so access to the volcano is closed in case of any seismic abnormalities.

How to Book

Since 2023, entry to Ijen Crater has required an advance online reservation through the BBKSDA Jatim (Natural Resources Conservation Agency of East Java) booking system. Walk-up entry is no longer guaranteed, and during peak season slots fill quickly — booking ahead is strongly recommended.

To complete your reservation, you will need:

• A valid passport or national ID
• A completed health/medical statement confirming you have no serious respiratory or cardiovascular conditions
• Payment of the entry fee at the time of booking

Entry fees are tiered by visitor type:

If you are booking through a local guide or travel agency, confirm that they handle the BBKSDA registration on your behalf — most reputable operators do, but it is worth verifying before you pay. Keep a digital or printed copy of your booking confirmation, as it will be checked at the gate.

Budget

Costs depend on your choice in favor of the self-organization of the tour or the services of a guide. To get to the base camp of the volcano on your own, you need to take into account a lot of nuances, and it is forbidden to climb Ijen without a guide in any case. If you find a local guide, you will get a tour just for you and your friends at a lower price than international travel agencies. On average, the whole package, including transportation, food, and climbing, costs about $110, or, in the case of local guides, about $80. 

If you decide to plan the whole tour on your own, don’t forget to take warm clothes, a flashlight, and a gas mask. If the climb is organized by a guide, he will prepare everything you need. It’s not hard to find local guides: there are many Facebook groups for foreigners living in Bali as well as locals. Try writing a post in the Ubud community group.

Note that the crater entrance fee is separate from any guide package. As of 2025, foreign visitors pay around 150,000 IDR on weekdays and 200,000 IDR on weekends. A mandatory on-site health check is also required before the climb, which adds a small additional fee of around 25,000 IDR. Confirm current rates with your guide or the park office when booking, as fees are reviewed periodically.

Ijen Volcano Route and Hike

Most of the travelers start their journey in Bali. Around six in the evening, a car usually picks people up from Ubud or other spots in the south of Bali and takes them to the westernmost part of the island, Gilimanuk port. The drive takes about six hours, depending on how far the starting point is from the west of Bali. Around midnight, you’ll arrive at the port where ferries depart regularly for the east coast of Java—Banyuwangi. It won’t take more than 30 minutes to cross from west Bali to east Java. 

The main camp at the foot of the Ijen volcano is 20 kilometers from the port. The locals have everything well organized: in Java, you will already have a Jeep waiting for you, dinner in a local restaurant before going to the camp, dry rations before the ascent, and breakfast after it. You’ll also be provided with flashlights and gas masks, which will come in handy when you approach the crater itself.

At one o’clock in the morning, the climbing begins. The temperature drops a lot during the night, especially as you climb to the top. Depending on your fitness, the climb can take between 1.5 and 2.5 hours. By climbing to the crater of Ijen before dawn, you can see the blue flames, which you can walk down the crater of the volcano to, thus getting as close as possible. By this point, everyone should already be wearing gas masks, or it will be impossible to breathe. Miners who started work long before sunrise are already carrying 80 kilograms of sulfur deposits on their shoulders at this time—and without any protective masks. Don’t forget to bring warm clothes. You’ll have already climbed to the top before sunrise, and after seeing the blue flames, you’ll be waiting for dawn. It will be cold!

From an elevation of 2,883 meters, you have an incredible view of the acid lake in the crater, whose hydrogen pH is below 0.3 on a scale of 0 to 14—for comparison, the pH of lemon juice is 2.

Having met the dawn, you can walk further along the crater’s edge, and around 8 a.m., start the return trip according to the same scheme: descent from the peak of Kawah Ijen volcano to the base camp, 20 kilometers to the East Java ferry, crossing the channel, breakfast on the western part of Bali, and the final 6 hours by car to Ubud. And you’ll dream of the volcano many more times.

Where to stay

Here are some accommodation options near Ijen Volcano that you might consider:

• Ijen Resort and Villas:
  • Location: Banyuwangi
  • Highlights: Offers a restaurant, outdoor pool, bar, and garden. Additional services include concierge services, a sun terrace, 24-hour front desk, airport transfers, room service, and free Wi-Fi.
• Grand Harvest Resort and Villas:
  • Location: Banyuwangi
  • Highlights: It is known for its spacious and comfortable rooms, making it a perfect choice for visiting Kawa Ijen.
• Aston Banyuwangi Hotel & Conference Center:
  • Location: Banyuwangi
  • Highlights: Recognized for its excellent hospitality and food, although it may be a bit farther from the public area.
• Kokoon Hotel Banyuwangi:
  • Highlights: It offers rooms with views overlooking Ijen Crater.
• Jiwa Jawa Resort Ijen:
  • Highlights: Located near Ijen Crater, it is praised for its super attentive and friendly staff.
• ILLIRA Hotel Banyuwangi:
  • Highlights: Provides rooms with city and sea views.

What to eat

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