Mount Rinjani 2 Day Trek to Senaru Crater Rim

Mount Rinjani's crater rim stands 2,641 metres above sea level, carved 13,000 years ago when a violent eruption collapsed the summit and left a six-kilometre-wide caldera holding Segara Anak, a crescent lake that Sasak communities have revered as the dwelling place of ancestors for centuries. The Senaru route, opened to organised trekking in the 1980s, climbs through four distinct ecological zones over 8.5 kilometres—lowland cultivation belt, tropical montane forest dense with endemic orchids and Javan lutungs, then subalpine heath where edelweiss and dwarf rhododendron cling to volcanic ash, and finally the exposed scree field below the rim where wind-sculpted lava formations mark the edge of the caldera. The mount rinjani 2 day trek to senaru crater rim operates year-round except during the January–March monsoon closure, when landslides render the upper trail impassable. Registration at the Rinjani Trek Centre in Senaru village is mandatory; the 250,000 IDR conservation fee per person per day funds trail maintenance, porter welfare programmes, and reforestation efforts coordinated by the Rinjani Trek Management Board. Every guided group includes a certified mountain guide trained in high-altitude first aid and a support team that carries camping gear, meals, and water filtration equipment to Post 3 at 2,000 metres and the rim camp at 2,641 metres. The rim itself is a knife-edge ridge of compacted ash and andesite rubble, wide enough for tent platforms but too narrow for permanent structures. Sunrise here reveals the full geometry of the caldera—Segara Anak 600 metres below, Gunung Barujari's active cone steaming on the lake's eastern shore, and on clear mornings the silhouette of Lombok's southern peaks stretching to the Alas Strait. Temperature drops to 4°C before dawn; afternoon cloud cover typically arrives by 14:00, obscuring views until the following morning. The descent retraces the ascent route, with most groups reaching Senaru village by mid-afternoon on the second day. No side trails branch from the Senaru route between the trailhead and rim—navigation is linear, and all water sources above 1,800 metres require treatment.