Mount Rinjani stands 3,726 metres above Lombok's northern coast, its caldera holding Segara Anak — a crescent lake formed after a volcanic collapse 13,000 years ago.
The Sasak people call the volcano Gunung Rinjani, naming it after the Sanskrit word for the sacred mountain Meru, and still conduct ritual offerings at its crater rim. Established as a national park in 1997, the 41,330-hectare reserve protects one of Indonesia's most active volcanic systems, with the young cone Gunung Barujari rising from the lake's southern shore and erupting as recently as 2016.
A mount rinjani trekking tour draws 15,000 climbers annually, most attempting the summit between April and December when monsoon rains subside. The ascent begins at Senaru or Sembalun villages, both sitting at 600 metres elevation. The Sembalun route climbs through open grassland before entering montane forest at 2,000 metres, where edelweiss blooms in silver clusters and black ebony langurs move through the canopy. The Senaru trail follows a steeper gradient through dense rainforest, crossing streams that feed into waterfalls visible from the approach road. Both routes converge at Pelawangan crater rim camps — Sembalun at 2,639 metres, Senaru at 2,641 metres — where trekkers spend the night before the pre-dawn summit push.
The final ascent covers 1,087 vertical metres across loose volcanic scree, with no established trail beyond the ridgeline. Summit attempts begin at 02:00 to reach the peak by sunrise, when clear skies reveal views extending to Mount Agung on Bali 130 kilometres west and Sumbawa's ridges 60 kilometres east. The crater lake, 600 metres below the rim, maintains a constant temperature of 20-22 degrees Celsius due to geothermal vents, and its shoreline hot springs remain accessible via a steep descent path requiring an additional two hours.
Mount rinjani trekking tour permits, regulated by Rinjani Trek Management Board since 2015, require all climbers to register at Senaru or Sembalun checkpoints between 07:00 and 17:00. The 150,000 IDR daily conservation fee supports trail maintenance and porter welfare programs. Park regulations mandate certified guides for all summit attempts and enforce a maximum group size of ten climbers per guide. The mountain closes entirely during January through March due to landslide risk on saturated trails.
48 h
