Where does the eastern Hindu Kush begin and end?

The eastern Hindu Kush is defined as the section of the Hindu Kush mountain system that extends from the Karambar Pass in the east to the Dorāh Pass in the west, located near Mount Tirich Mir.1

While the Karambar Pass is generally accepted as the eastern boundary, determining the precise limit is complex due to the region's rugged topography. This eastern section contains the highest peaks of the entire mountain system, including Mounts Noshaq, Istoro Nal, and Tirich Mir.21