The Tengchong volcanic field, located in southern China near the border with Burma (Myanmar), was active during five periods ranging from the early Pliocene to the Holocene. Three main stages produced Pliocene to mid-Pleistocene basaltic rocks, mid- to late-Pleistocene silicic pyroclastic rocks, and Holocene basaltic andesites. The youngest volcanism in the 600 km2 field occurred in two stages during the early and late Holocene. Volcanic cones at the northern end of the field are sparsely vegetated and have clearly visible lava flows. Three basaltic andesite centers, Dayinshshan, Maanshan, and possibly Heikongshan, are of Holocene age. An unconfirmed explosive eruption took place in 1609 CE, and there are unconfirmed reports of eruptions during the Qing Dynasty (1644-1911 CE). The area includes active geothermal fields, the largest and highest temperature of which is the Rehai geothermal field, where more than 20 hydrothermal eruptions have occurred since 1993.