Khunjerab Pass (sometimes called Khunerjab Pass) is a high mountain pass on the northern border of Pakistan with China, at an elevation of 4.733m (15,528ft) above the sea level. It's the highest border-crossing in the world and the highest point on the Karakoram Highway.
Khunjerab Pass is located in the Karakoram Mountains in a strategic position on the northern border of Pakistan's Gilgit–Baltistan Hunza-Nagar District on the southwest border of the Xinjiang region of China. For comparison, Mont Blanc, the tallest mountain in Western Europe, is 4.810 m and Mount Whitney, the highest point in the 48 contiguous United States, is 4.421m. This section of the road was completed in 1982 and is possibly the highest metalled border crossing in the world. The road to the summit is asphalted.
The high elevation with its risk of altitude sickness, weather concerns, steep road grade and overall inaccessibility make the travel dangerous and difficult. The long, relatively flat pass is often snow-covered during the winter season and as a consequence is generally closed from November 30 to May 1. Choose your time carefully. There are some police checkpoints along the highway in China that may slow down your journey significantly if there are many cars and trucks. Besham is the start of Kohsitan which is famous for its ruggedness and stubbornness. It is highly advisable to limit your stay and keep going preferably during day time. Kohistan borders Baltistan which is relatively safe. Main town to stay overnight is Chillas. This relatively flat and well signposted mountain highway is the highest international road in the world and includes the world’s highest international border crossing, the Youyi Friendship Bridge and access to the stunning Karakul Mountain Lake. The road is generally closed during the Winter months owing to snow making it impassable. Don’t forget your passport.
Pic: Travelling Pakistan