About this tour
This overnight expedition departs Ubud at 7pm, crossing to Java by ferry before tackling Mount Ijen's volcanic crater. You'll hike 1.75 hours to the rim, then descend to witness the rare blue sulphur flames flickering across an acidic crater lake. The 4-hour drive plus ferry crossing, pre-dawn ascent, and close encounter with one of Indonesia's most geologically extreme landscapes makes for a punishing but unforgettable push.
Highlights
- Watch electric-blue sulphur flames ignite at crater's edge
- Peer into 200-metre acidic crater lake at +40°C
- Cross Java by ferry from Bali, experience remote volcanic zone
- Guided night hike with torches and gas masks provided
- Breakfast and all park fees included in package
What to expect
You'll leave your hotel in darkness and spend four hours in an air-conditioned vehicle, then cross by ferry to Java's Ketapang port. Another 1.5 hours' drive follows. The hike itself is steep and takes 105 minutes; bring a torch because you're climbing at night on a well-kept trail through volcanic vegetation. At the crater rim, the guide escorts you down closer to see the blue flames—sulphur combustion, not fire—dancing across the acidic water. Temperatures drop noticeably at altitude; the air becomes thick with volcanic fumes. Gas masks are provided. This is raw geology, not a gentle walk.
Good to know
Moderate fitness essential; the ascent is relentless. Bring a warm jumper, snacks, and cash. You'll need your passport photo and vaccination certificate. A doctor's letter confirming fitness is mandatory, or pay 50,000 IDR for a health check in Java. Minimum two people required. Lunch is not included.
Tour sold and operated by Viator via Viator. Descriptions on this page are original BugBitten summaries written by our team — not copied from the operator. Prices and availability are confirmed at checkout.