Kumtor valley, Kyrgyzstan.
Seok Pass is situated on the ancient Silk Road route connecting Barskon on Lake Issyk-Kul and Kashgar in China's Xinjiang province across the Tian Shan mountains. It is one of three major passes on this route, located between Barskoon Pass (elevation 3,819 metres [12,530 ft]) and Bedel Pass (elevation 4,284 metres [14,060 ft]). As the border road over Bedel Pass to China has remained closed since Soviet times, Seok Pass is nowadays significant mainly as a strategic gateway on the A364 road to the southeastern high mountain desert areas of Kyrgyzstan along the Chinese border, and to the border posts at Kara-Say and Ak-Shyrak.
Roadside marker at Seok Pass, altitude 4,028 metres (13,220 ft)
The name means "Bone Pass" in Kyrgyz, a reference to the Urkun incident of 1916, when thousands of Kyrgyz died attempting to cross the border into China, fleeing from Tsarist Russian forces.