Aerial photo taken on May 26, 2022 shows villagers working at the salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Zhou Dixiao)

Photo taken on May 26, 2022 shows salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Fan Fan)

Aerial photo taken on May 26, 2022 shows salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Zhou Dixiao)

Photo taken on May 26, 2022 shows salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Zhou Dixiao)

Aerial photo taken on May 26, 2022 shows villagers working at the salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Zhou Dixiao)

Aerial photo taken on May 26, 2022 shows villagers working at the salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Zhou Dixiao)

Aerial photo taken on May 26, 2022 shows salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Zhou Dixiao)

A villager works in the salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region, May 26, 2022. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Chen Shangcai)

A villager works in the salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region, May 26, 2022. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Chen Shangcai)

Aerial photo taken on May 26, 2022 shows villagers working at the salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Zhou Dixiao)

Aerial photo taken on May 26, 2022 shows salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Zhou Dixiao)

Photo taken on May 25, 2022 shows salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Fan Fan)

Aerial photo taken on May 26, 2022 shows salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Zhou Dixiao)

Villagers work in the salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region, May 26, 2022. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Chen Shangcai)

Aerial photo taken on May 26, 2022 shows salt pans in Naxi Township of Mangkam County, Qamdo, southwest China's Tibet Autonomous Region. Local people of Mangkam County follow a traditional salt harvesting method by collecting brines from salt mines and ponds and evaporating them in the sun until crystallization. (Xinhua/Zhou Dixiao)