Sost or Sust, the only dry port town in Northern Pakistan, is situated in Gojal region of Gilgit Baltistan of Pakistan. The dry port at Sost makes it a major trade market of the area as well as an attraction for tourists. It is the last major town inside Pakistan on the Karakoram Highway before the Chinese border .
The town is an important place on the Karakoram Highway for all passenger and Cargo transport because all traffic crossing the Pakistan-China border passes through this town and the Pakistani immigration and customs departments are based here.
The Main languages spoken here is Wakhi and Brushki. The Silk Route Dry Port started its business operations at the port Sost (Upper Hunza) near Khunjarab pass Gilgit-Baltistan. Annual trade between China and Pakistan has increased from less than $2 billion in 2002 to $6.9 billion, with a goal of $15 billion by 2014. Sost dry port is the first formal port at the China-Pakistan border, facilitating customs clearance and other formalities for goods moving from the city of Kashgar and the surrounding Xinjiang autonomous region in China to the commercial centers of Pakistan.
The town of Sost is connected by the Karakoram Highway to Karimabad, Gilgit and Chilas on the South and to the Chinese cities of Tashkurgan, Upal and Kashgar in the North.
Passenger road service between the Tashkurgan and the Pakistani cities of Sost and Gilgit also exists, and there is road service between Kashi and Gilgit (via Tashkurgan and Sust ). However, the border crossing between China and Pakistan at Khunjerab Pass (the highest border of the world) is open only between May 1 and October 15 of every year. During winter, the roads are blocked by snow.