Aerial photo taken on July 9, 2022 shows a herd of sika deer foraging by Xingkai Lake at the Xingkai Lake National Nature Reserve in Jixi City of northeast China's Heilongjiang Province. (Xinhua/Zhang Tao)

A tourist takes photos by Xingkai Lake at the Xingkai Lake National Nature Reserve in Jixi City of northeast China's Heilongjiang Province, July 9, 2022. (Xinhua/Zhang Tao)

A bird flies over Xingkai Lake at the Xingkai Lake National Nature Reserve in Jixi City of northeast China's Heilongjiang Province, July 9, 2022. (Xinhua/Xie Jianfei)

Aerial photo taken on July 9, 2022 shows the scenery of Xingkai Lake at the Xingkai Lake National Nature Reserve in Jixi City of northeast China's Heilongjiang Province. (Xinhua/Zhang Tao)

Aerial photo taken on July 9, 2022 shows the scenery of Xingkai Lake at the Xingkai Lake National Nature Reserve in Jixi City of northeast China's Heilongjiang Province. (Xinhua/Zhang Tao)

A tourist takes photos by Xingkai Lake at the Xingkai Lake National Nature Reserve in Jixi City of northeast China's Heilongjiang Province, July 9, 2022. (Xinhua/Zhang Tao)

Photo taken on July 9, 2022 shows the scenery of Xingkai Lake at the Xingkai Lake National Nature Reserve in Jixi City of northeast China's Heilongjiang Province. (Xinhua/Xie Jianfei)

Photo taken on July 9, 2022 shows the scenery of Xingkai Lake at the Xingkai Lake National Nature Reserve in Jixi City of northeast China's Heilongjiang Province. (Xinhua/Zhang Tao)

Aerial photo taken on July 9, 2022 shows the scenery of Xingkai Lake at the Xingkai Lake National Nature Reserve in Jixi City of northeast China's Heilongjiang Province. (Xinhua/Xie Jianfei)