Mount Sinabung (Indonesian: Gunung Sinabung, also Dolok Sinabung,[3] Deleng Sinabun,[4] Dolok Sinaboen,[5] Dolok Sinaboeng[6] and Sinabuna[7]) is a Pleistocene-to-Holocene stratovolcano of andesite and dacite in the Karo plateau of Karo Regency, North Sumatra, Indonesia, 25 miles from Lake Toba supervolcano. Many old lava flows are on its flanks and the last known eruption, before recent times, occurred in the year 1600.[citation needed] Solfataric activities (cracks where steam, gas, and lava are emitted) were last observed at the summit in 1912; recent documented events include an eruption in the early hours of 29 August 2010 and eruptions in September and November 2013, January and February 2014.[1][8]