It has a 2.03-kilometer (1.26 mi) diameter caldera lake called Lake Leonard. Amacan Thermal Area is located 5 aerial kilometer south-southwest of Lake Leonard.[2]
The Leonard Kniaseff Volcano's area has been an object to a geothermal exploration program.[3]
Manat thermal area is north of Lake Leonard, solfataras occur around its southwest rim, and active solfataras, fumaroles, and hot springs are found in the Amacan-Gopod thermal area south of the lake.[citation needed]
There was a scare in 1995 but PHIVOLCS' investigation at that time did not disclose any unusual activity, and no unusual activity has been reported since then.[citation needed]
Its last eruption was dated as early as c. 120AD.[4]
^"Leonard Kniaseff". DOST Website. Philippine Institute of Volcanology and Seismology. Archived from the original on August 5, 2018. Retrieved May 23, 2017.