Ijen Merapi Ungup-Ungup Caldera Nature Reserve has 8 named peaks. The highest is Gunung Merapi at 2,803 m. Other notable peaks include Gunung Merapi Ungup-Ungup, Gunung Ijen and Gunung Remuk.
There are 8 named mountains in Ijen Merapi Ungup-Ungup Caldera Nature Reserve. The highest and the most prominent mountain is Gunung Merapi.

The highest peak in Ijen Merapi Ungup-Ungup Caldera Nature Reserve is Gunung Merapi, at 2,803 m.
Notable peaks in Ijen Merapi Ungup-Ungup Caldera Nature Reserve include Gunung Merapi, Gunung Merapi Ungup-Ungup, Gunung Ijen, Gunung Remuk and Gunung Pawenan.
