It has a 203 km diameter caldera lake called Lake Leonard. Amacan Thermal Area is located 5 cadastral km SSW of Lake Leonard.
Leonard Kniazeff is one of the active volcanos in the Philippines, part of the Pacific ring of fire.
An andesitic-to-dacitic stratovolcano complex in the Leonard Range is truncated by a 4 x 5 km caldera partially filled by Lake Leonard. The volcano (also known as Leonard Kniazeff) is located east of the head of Davao Gulf in SE Mindanao, east of the major N-S-trending Philippine Fault. Activity at the Leonard Range dates back to 1.1 million years. A dome building stage began about 290,000 years ago, producing a series of lava domes in the region surrounding Lake Leonard. A younger stage involved the eruption of the Paloc pyroclastic deposits from the late-Pleistocene to Holocene and the formation of the caldera. Holocene radiocarbon dates ranging from about 6000 to 1800 years ago were obtained from the Paloc pyroclastic deposits. The Leonard Range (or North Davao) area has been the object of a geothermal exploration program. The Manat thermal area is located north of Lake Leonard, solfataras occur its SW rim, and active solfataras, fumaroles, and hot springs are found in the Amacan-Gopod thermal area south of the lake.
The Leonard Kniazeff (North Davao) area has been the object of a geothermal exploration program.
Manat thermal area is located north of Lake Leonard, solfataras occur around its SW rim, and active solfataras, fumaroles, and hot springs are found in the Amacan-Gopod thermal area south of the lake.
There was a scare in 1995 but PHIVOLCS investigation at the time did not disclose any unusual activity, and no unusual activity has been reported since.