Birds fly over Qixinghe National Nature Reserve in Baoqing County, Shuangyashan City, northeast China's Heilongjiang Province, June 17, 2022. Photo:Xinhua

Photo taken on June 17, 2022 shows the scenery of Qixinghe National Nature Reserve in Baoqing County, Shuangyashan City, northeast China's Heilongjiang Province. Photo:Xinhua

Tourists enjoy the scenery on a boat in Qixinghe National Nature Reserve in Baoqing County, Shuangyashan City, northeast China's Heilongjiang Province, June 17, 2022. Photo:Xinhua

Aerial photo taken on June 17, 2022 shows the scenery of Qixinghe National Nature Reserve in Baoqing County, Shuangyashan City, northeast China's Heilongjiang Province. Photo:Xinhua

Aerial photo taken on June 17, 2022 shows the scenery of Qixinghe National Nature Reserve in Baoqing County, Shuangyashan City, northeast China's Heilongjiang Province. Photo:Xinhua

Aerial photo taken on June 17, 2022 shows the scenery of Qixinghe National Nature Reserve in Baoqing County, Shuangyashan City, northeast China's Heilongjiang Province. Photo:Xinhua

Aerial photo taken on June 17, 2022 shows the scenery of Qixinghe National Nature Reserve in Baoqing County, Shuangyashan City, northeast China's Heilongjiang Province. Photo:Xinhua

Photo taken on June 17, 2022 shows the scenery of Qixinghe National Nature Reserve in Baoqing County, Shuangyashan City, northeast China's Heilongjiang Province. Photo:Xinhua

A bird flies over Qixinghe National Nature Reserve in Baoqing County, Shuangyashan City, northeast China's Heilongjiang Province, June 17, 2022. Photo:Xinhua