Simplify the following text for a Grade 8 native English-speaking person.
Original: Turch Mir ( alternatively Terich Mir and Terichmir ) is the highest mountain in the Hindu Kush region and the highest mountain outside of the Himalaya-Karakoram range , located in Khyber-Pakhtoonkhwa , Pakistan .
Simplified: Tirich Mir ( also called Terich Mir and Terichmir ) is the highest mountain in the Hindu Kush region of northern Pakistan .