Mount Tambora (or Tamboro) is an active stratovolcano, also known as a composite volcano, on the island of Sumbawa, Indonesia. Sumbawa is flanked both to the north and south by oceanic crust, and Tambora was formed by the active subduction zone beneath it. This raised Mount Tambora as high as 4,300 m (14,100 ft), making it formerly one of the tallest peaks in the Indonesian archipelago. After a large magma chamber inside the mountain filled over the course of several decades, volcanic activity reached a historic climax in the super-colossal eruption of April 1815.
The 1815 eruption is rated 7 on the Volcanic Explosivity Index, the only such eruption since the Lake Taupo eruption in about 180 AD. With an estimated ejecta volume of 160 cubic kilometers, Tambora's 1815 outburst was the largest volcanic eruption in recorded history. The explosion was heard on Sumatra island (more than 2,000 km (1,200 mi) away). Heavy volcanic ash falls were observed as far away as Borneo, Sulawesi, Java and Maluku islands. Most deaths from the eruption were from starvation and disease, as the eruptive fallout ruined agricultural productivity in the local region. The death toll was at least 71,000 people (the most deadly eruption in recorded history), of whom 11,000–12,000 were killed directly by the eruption; the often-cited figure of 92,000 people killed is believed to be overestimated. The eruption created global climate anomalies that included the phenomenon known as "volcanic winter": 1816 became known as the "Year Without a Summer" because of the effect on North American and European weather. Agricultural crops failed and livestock died in much of the Northern Hemisphere, resulting in the worst famine of the 19th century.
During an excavation in 2004, a team of archaeologists discovered cultural remains buried by the 1815 eruption. They were kept intact beneath the 3 m (9.8 ft) deep pyroclastic deposits. At the site, dubbed the Pompeii of the East, the artifacts were preserved in the positions they had occupied in 1815.
This is a difficult mountain to reach let alone climb. Few non-Indonesian visitors ever make it to this remote corner of northern Sumbawa and far fewer still to the top of mighty Mount Tambora.
To reach Tambora you need to get to the village of Pancasila. It is problematic if you want to do this in one day from Sumbawa Besar. If you want to try, take the Sumbawa Besar/Dompu bus very early in the morning and tell the driver you want to go to Calabai/Pancasila Mau mendaki Tambora (I want to climb Tambora). He will drop you after four to five hours at the tee-intersection from where the road to the right goes to Dompu (about 20 km away) and the road to the left takes you to Calabai. There are regular buses to Calabai but the road is very bad and the 110 km trip takes 4-5 hours. From Calabai you have to take an ojek (back of a motorcycle) to Pancasila.
At Pancasila you will be directed to K-Pata's headquarters. The manager is Saiful and his wife is Irma. They will give you a room to stay, feed you well and organise guides. A fair price for food and lodging is Rp 100,000 per night and the guides require Rp 200,000 per day. This is a very reasonable fee considering the amount of work they are required to do on the trip, the nature of the terrain and the length of the walk.
The walk is through virgin jungle. It is incredibly thick in parts and a lot of parang work is required. You will walk for hours along an almost indecipherable trail.
for further details visit http://wikitravel.org/en/Mount_Tambora
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