Amacan Thermal Area is located 5 aerial kilometer south-southwest of Lake Leonard.

[2] Leonard Kniaseff is one of the active volcanoes in the Philippines, part of the Pacific ring of fire.

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] Its last eruption was dated as early as c. 120 AD.