Tangkoko Nature Reserve has 5 named peaks. The highest is Gunung Dua Saudara at 1,351 m. Other notable peaks include Gunung Batuangusbaru, Tongkoko and Gunung Tangkoko.
There are 5 named mountains in Tangkoko Nature Reserve. The highest and the most prominent mountain is Gunung Dua Saudara.

The highest peak in Tangkoko Nature Reserve is Gunung Dua Saudara, at 1,351 m.
Notable peaks in Tangkoko Nature Reserve include Gunung Dua Saudara, Gunung Batuangusbaru, Tongkoko, Gunung Tangkoko and Gunung Batuangus.
