Which mountain is taller, Istor-o-Nal or Siguang Ri?
Istor-o-Nal: Istor-o-Nal or इस्तोर-ओ-नल is the third highest mountain in the Hindu Kush, in the Chitral District of the North-West Frontier Province of Pakistan. Istor-o-Nal:  Because Istor-o-Nal is behind the higher peak of Tirich Mir from many viewpoints, it is not easily visible and therefore not well known.
i don't know