Heavy volcanic ash rains were observed as far away as Borneo, Sulawesi, Java, and Maluku islands, and the maximum elevation of Tambora was reduced from about 4,300 metres (14,100 ft) to 2,850 metres (9,350 feet). The explosion was heard on Sumatra island, more than 2,000 kilometres (1,200 miles) away. Volcanic activity reached a peak that year, culminating in an explosive eruption. The magma chamber under Tambora had been drained by previous eruptions and underwent several centuries of dormancy as it refilled. Tambora's 1815 eruption was the largest in recorded human history and the largest of the Holocene (10,000 years ago to present). Before its 1815 eruption, it was more than 4,300 metres (14,100 feet) high, making it one of the tallest peaks in the Indonesian archipelago. It was formed by the active subduction zones beneath it. Mount Tambora, or Tomboro, is an active stratovolcano in West Nusa Tenggara, Sumbawa, Indonesia in one of the Lesser Sunda Islands of Indonesia. Trachybasaltic- trachyandesitic stratovolcano Bima & Dompu Regencies, Sanggar peninsula, Sumbawa, Lesser Sunda Islands, Indonesia
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