The nearly oval-shaped Heart Peaks shield volcano is made of basalt and trachybasalt with a composite thickness up to ; pyroclastic rocks are also present. It lies just west of the much larger Level Mountain shield and southwest of the Kawdy volcanoes. A series of steep-sided lava domes composed of porphyritic rhyolite and minor trachyte are situated on the western flank of Heart Peaks and display colours such as light green and pink. Rhyolitic lava domes are also present on its summit. The shield is surrounded by tributaries of the Inkin River, which flows northwest into the Taku River.