Aerial photo taken on June 2, 2020 shows a vehicle driving through Aha Lake National Wetland Park in Guiyang, capital of southwest China's Guizhou Province. (Xinhua/Tao Liang)

People visit Aha Lake National Wetland Park in Guiyang, capital of southwest China's Guizhou Province, June 2, 2020. (Xinhua/Tao Liang)

Aerial photo taken on June 2, 2020 shows the scenery of Aha Lake National Wetland Park in Guiyang, capital of southwest China's Guizhou Province. (Xinhua/Tao Liang)

Aerial photo taken on June 2, 2020 shows the scenery of Aha Lake National Wetland Park in Guiyang, capital of southwest China's Guizhou Province. (Xinhua/Tao Liang)

Aerial photo taken on June 2, 2020 shows the scenery of Aha Lake National Wetland Park in Guiyang, capital of southwest China's Guizhou Province. (Xinhua/Tao Liang)

Aerial photo taken on June 2, 2020 shows the scenery of Aha Lake National Wetland Park in Guiyang, capital of southwest China's Guizhou Province. (Xinhua/Tao Liang)

People visit Aha Lake National Wetland Park in Guiyang, capital of southwest China's Guizhou Province, June 2, 2020. (Xinhua/Tao Liang)