The Karakoram Highway (KKH) is the highest paved international road in the world. It connects China and Pakistan across the Karakoram mountain range, through the Khunjerab Pass, at an altitude of 4,693 m/15,397 ft. Due to its high elevation and the difficult conditions in which it was constructed, it is also referred to as the "Ninth Wonder of the World." Known as the Friendship Highway in China, it was built by the governments of Pakistan and China, and was completed in 1986, after 20 years of construction. 810 Pakistani and 82 Chinese workers lost their lives, mostly in landslides and falls, while building the highway. The route of the KKH traces one of the many paths of the ancient Silk Road. On the Pakistani side, the road was constructed by FWO (Frontier Works Organization), employing the Pakistan Army Corps of Engineers. Presently, the Engineer-in-Chief branch of the Pakistani Army is working on a project documenting the history of the highway. It is being written by Brigadier (Retired) Muhammad Mumtaz Khalid, who oversaw its construction.