Chilas (Urdu: چلاس) is a small town located in the Gilgit-Baltistan, Pakistan on the left side of river Indus. It is part of the Silk Road connected by the Karakoram Highway which links it to Islamabad in the south via Dassu, Besham, Battagram, Mansehra, Abbottabad, Haripur, and Hasan Abdal. In the north, Chilas is connected to the Chinese cities of Tashkurgan and Kashgar via Gilgit, Aliabad, Sust, and the Khunjerab Pass.
There are more than 50,000 pieces of Buddhist rock art (petroglyphs) and inscriptions all along the Karakoram Highway in Gilgit-Baltistan of Pakistan that are concentrated at ten major sites between Hunza and Shatial, more have been found in the area of Skardu and Shigar (in Shigar even the remains of a Buddhist monastery were found in 1984 by Jettmar and Thewalt). The carvings were left by various invaders, traders and pilgrims who passed along the trade route, as well as by locals. The earliest date back to between 5000 and 1000 BC, showing single animals, triangular men and hunting scenes in which the animals sometimes are larger than the hunters. These carvings were pecked into the rocks with stone tools and are covered with a thick patina that proves their age. Later — mostly Buddhist — carvings were sometimes executed with a sharp chisel.