![Villagers work in saline fields in Mangkam County, southwest China\'s Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)](http://www.ecns.cn/hd/2019/05/24/763c89e194084ec590f9ece1bc592426.jpg)
Villagers work in saline fields in Mangkam County, southwest China's Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)
![A villager pours brines into saline fields in Mangkam County, southwest China\'s Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)](http://www.ecns.cn/hd/2019/05/24/d018ae1788d24d5cabf923e370d58c81.jpg)
A villager pours brines into saline fields in Mangkam County, southwest China's Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)
![Aerial photo shows saline fields in Mangkam County, southwest China\'s Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)](http://www.ecns.cn/hd/2019/05/24/8b0ee6aef09a42d2bec9bee0a0db4780.jpg)
Aerial photo shows saline fields in Mangkam County, southwest China's Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)
![Aerial photo shows saline fields in Mangkam County, southwest China\'s Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)](http://www.ecns.cn/hd/2019/05/24/ad7463017de24edda16f7d5c7447130b.jpg)
Aerial photo shows saline fields in Mangkam County, southwest China's Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)
![Aerial photo shows saline fields in Mangkam County, southwest China\'s Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)](http://www.ecns.cn/hd/2019/05/24/da60bf682d154378b84a2997135c6276.jpg)
Aerial photo shows saline fields in Mangkam County, southwest China's Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)
![Aerial photo shows saline fields in Mangkam County, southwest China\'s Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)](http://www.ecns.cn/hd/2019/05/24/6b8114a27dae406da1926a025563b679.jpg)
Aerial photo shows saline fields in Mangkam County, southwest China's Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)
![Aerial photo shows saline fields in Mangkam County, southwest China\'s Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)](http://www.ecns.cn/hd/2019/05/24/ba3823caf11741b48e4b2311ee2bf5aa.jpg)
Aerial photo shows saline fields in Mangkam County, southwest China's Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)
![Photo shows salt stalactites formed by trickling brines in Mangkam County, southwest China\'s Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)](http://www.ecns.cn/hd/2019/05/24/72b42ef1692944b0bb5a88b0439813fe.jpg)
Photo shows salt stalactites formed by trickling brines in Mangkam County, southwest China's Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)
![Aerial photo shows saline fields in Mangkam County, southwest China\'s Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)](http://www.ecns.cn/hd/2019/05/24/8b621d7ae0214876aef56c25448fd70f.jpg)
Aerial photo shows saline fields in Mangkam County, southwest China's Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)
![A villager collects salt at a saline field in Mangkam County, southwest China\'s Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)](http://www.ecns.cn/hd/2019/05/24/ece67a0f80af4d1db9a3e164dad31adc.jpg)
A villager collects salt at a saline field in Mangkam County, southwest China's Tibet Autonomous Region, May 22, 2019. An ancient technique of salt production since Tang Dynasty (618-907) is well-preserved in Mangkam County. Local people follow a salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Li Xin)