The eruption truncated the volcano into a broad shape with two peaks and a flat area  1.1 km wide with Alun-Alun crater in the middle, making the mountain appear as a twin volcano; one of the peaks is called Papandayan and the other Mount Puntang.
The volcanic eruption resulted in a broad, two-peaked mountain with a flat area 1.1 km wide and Alun-Alun crater at its center, creating an illusion of a twin volcano; one peak is known as Papandayan, while the other is Mount Puntang.