Indonesia
Mount Tambora
The 1815 eruption brought the Year Without a Summer; the crater is six kilometres wide.
From the rim, the hole in the world takes a moment to process: six kilometres across, over a kilometre deep, the scar of the most powerful eruption in recorded history. Forest has climbed back over the devastation below.
Tambora, on Sumbawa, blew apart in April 1815 in the largest eruption in recorded history, a VEI-7 event whose atmospheric veil brought 1816's Year Without a Summer, with crop failures across the Northern Hemisphere documented by NOAA and NASA climate records. The mountain lost over a kilometre of height and kept a caldera roughly six kilometres wide. The park reopened designated climbing in 2026 with registration and guide requirements, the rim trek running two to three days from the villages on its flanks, and route availability confirmed immediately before travel.
Solo
A registered guide carries the route knowledge; the climber carries the awe.
Friends
Camp logistics and summit mornings divide well across a fit group.
- Smithsonian records the 1815 eruption as VEI-7, the largest in recorded history.
- Its aerosols caused the Year Without a Summer across the Northern Hemisphere.
- The summit caldera measures roughly six kilometres across.
- A registered, guided rim climb reopened in 2026 as a multi-day journey.
Singang, Sumbawa's tamarind and turmeric fish soup, is the island's named dish.
Trek provisioning is agreed in advance; the Doro Ncanga route carries no water at all.
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