|Elevation||4,362 m (14,311 ft)|
The Kulma Pass (simplified Chinese: 阔勒买山口; traditional Chinese: 闊勒買山口; pinyin: Kuòlèmài Shānkǒu), also Qolma Pass, is a mountain pass across the Pamir Mountains on the border between the Gorno-Badakhshan Autonomous Region of Tajikistan and the Xinjiang Autonomous Region of China. Asian Highway AH66 runs through the pass, which provides for the only overland border crossing along the 450 km boundary between the two nations.
The pass opens from the north to the southeast, and is 500 m wide from north to south and 1 km in length from east to west with a gentle incline not exceeding 20 degrees. On the Tajik side, the pass is 80 km by road to Murghab and about 850 km to Dushanbe. On the Chinese side, the pass is 13.9 km from Karasu (卡拉苏口岸), a port of entry on the Karakorum Highway which leads to Tashkurgan (60–70 km) and Kashgar (220 km). The pass is open from the 16th to the 30th day of each month from May to November.
The pass was closed for many years due to political tensions between the Soviet Union and China, and then the Tajik Civil War. In 1997, China and Tajikistan signed an agreement to develop a commercial corridor between the two countries through the pass. The opening of the pass reduced cargo travel time between the two countries by ten to fifteen days, obviating lengthy detours into Kyrgyzstan and Uzbekistan.
Karasu Port of Entry
The Karasu Port of Entry opened on May 25, 2004, and traffic volume grew considerably. In the first three months after the pass opened, an official tally by the Tajik Ministry of Traffic and Roads counted legal crossings of just 17 trucks, 10 buses, 240 tons of cargo, and 171 people over a three-month period. Unofficial transits are believed to be more common, as many locals lack passports needed to cross the pass legally.
From May to August 2006, the Chinese Ministry of Commerce registered 649 cargo shipments totaling 11,218.5 metric tons of goods. In the same three months the following year, traffic volume reached 1,836 cargo shipments and 30,556 metric tons. In all, travelers made 12,500 trips through the pass in 2007 transporting 56,300 metric tons of goods worth US$250 million. Commonly traded goods include automobiles, construction materials, machinery, electronics, furniture, eggs, and rice.
In 2013, 31,000 tons of goods were shipped through the Kulma Pass and processed at the Karasu Border Crossing.
The bilateral agreement signed between China and Tajikistan includes the opening of the pass for nationals of all countries, however travelers have reported difficulty being permitted crossing. In 2014 and 2015 travelers reported they were able to cross through the pass, but only after expending special effort.
- Townsend, Jacob (June 2005). China and Afghan Opiates: Assessing the Risk. Central-Asia Caucasus Institute, Silk Road Studies Program  at Johns Hopkins University and Uppsala University.