Aerial photo taken on March 4, 2020 shows the spring scenery of fields in Tonghai County, Yuxi City, southwest China's Yunnan Province. (Xinhua/Hu Chao)

TONGHAI, March 6 (Xinhua) -- Tonghai County occupies the fertile valley of Qilu Lake, surrounded on all sides by mountains. Located on the south side of the lake, the county is separated from the lake by a mile-wide strip of farmland.

Aerial photo taken on March 4, 2020 shows the spring scenery of fields in Tonghai County, Yuxi City, southwest China's Yunnan Province. (Xinhua/Hu Chao)

Aerial photo taken on March 4, 2020 shows the spring scenery of fields in Tonghai County, Yuxi City, southwest China's Yunnan Province. (Xinhua/Hu Chao)

Aerial photo taken on March 4, 2020 shows the spring scenery of fields in Tonghai County, Yuxi City, southwest China's Yunnan Province. (Xinhua/Hu Chao)

Aerial photo taken on March 4, 2020 shows the spring scenery of fields in Tonghai County, Yuxi City, southwest China's Yunnan Province. (Xinhua/Hu Chao)

Aerial photo taken on March 4, 2020 shows the spring scenery of fields in Tonghai County, Yuxi City, southwest China's Yunnan Province. (Xinhua/Hu Chao)

Aerial photo taken on March 3, 2020 shows the spring scenery of fields in Tonghai County, Yuxi City, southwest China's Yunnan Province. (Xinhua/Hu Chao)

Aerial photo taken on March 4, 2020 shows the spring scenery of fields in Tonghai County, Yuxi City, southwest China's Yunnan Province. (Xinhua/Hu Chao)

Aerial photo taken on March 4, 2020 shows the spring scenery of fields in Tonghai County, Yuxi City, southwest China's Yunnan Province. (Xinhua/Hu Chao)

Aerial photo taken on March 4, 2020 shows the spring scenery of fields in Tonghai County, Yuxi City, southwest China's Yunnan Province. (Xinhua/Hu Chao)

Aerial photo taken on March 4, 2020 shows the spring scenery of fields in Tonghai County, Yuxi City, southwest China's Yunnan Province. (Xinhua/Hu Chao)