KUNMING, June 23 (Xinhua) -- The 83rd Mekong River joint patrol led by China, Laos, Myanmar and Thailand concluded Friday at Guanlei Port, Xishuangbanna Dai Autonomous Prefecture in southwest China's Yunnan Province.
A total of 209 law enforcement officers from the four countries, in seven vessels, participated in the mission, which covered 657 km in four days, according to the Yunnan provincial public security department.
The patrol was conducted prior to the International Drug Control Day which falls on June 26. They conducted a series of anti-drug campaigns, releasing movies and distributing brochures.
The Mekong River, known as the Lancang River in China, is a vital waterway for cross-border shipping among China, Laos, Myanmar, Thailand, Cambodia and Vietnam.
Joint patrols on the Mekong River started in December 2011.