View of wetland parks in Changshu, E China's Jiangsu

This undated file photo shows waterfowls at the Shajiabang national wetland park in Changshu, east China's Jiangsu Province.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua)

This aerial photo taken on Nov. 15, 2022 shows a view of the Shanghu national urban wetland park in Changshu, east China's Jiangsu Province.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Yang Lei)

A man takes photos in the Shajiabang national wetland park in Changshu, east China's Jiangsu Province, Nov. 15, 2022.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Ji Chunpeng)

This aerial photo taken on Nov. 15, 2022 shows a view of the Shajiabang national wetland park in Changshu, east China's Jiangsu Province.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Ji Chunpeng)

This photo taken on Nov. 15, 2022 shows a view of the Shanghu national urban wetland park in Changshu, east China's Jiangsu Province.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Yang Lei)

This photo taken on Nov. 15, 2022 shows a view of the Shanghu national urban wetland park in Changshu, east China's Jiangsu Province.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Yang Lei)

This aerial photo taken on Nov. 15, 2022 shows a view of the Shajiabang national wetland park in Changshu, east China's Jiangsu Province.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Yang Lei)

This photo taken on Nov. 15, 2022 shows a view of the Shajiabang national wetland park in Changshu, east China's Jiangsu Province.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Yang Lei)

This photo taken on Nov. 15, 2022 shows a view of the Shajiabang national wetland park in Changshu, east China's Jiangsu Province.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Yang Lei)

This aerial photo taken on Nov. 15, 2022 shows a view of the Shajiabang national wetland park in Changshu, east China's Jiangsu Province.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Yang Lei)

Shutterbugs take photos in the Shanghu national urban wetland park in Changshu, east China's Jiangsu Province, Nov. 15, 2022.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Ji Chunpeng)

This aerial photo taken on Nov. 15, 2022 shows a view of the Shanghu national urban wetland park in Changshu, east China's Jiangsu Province.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Ji Chunpeng)

This photo taken on Nov. 15, 2022 shows a view of the Shajiabang national wetland park in Changshu, east China's Jiangsu Province.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Yang Lei)

This aerial photo taken on Nov. 15, 2022 shows a view of the Shanghu national urban wetland park in Changshu, east China's Jiangsu Province.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Ji Chunpeng)

Birds perch on tree branches in the Shanghu national urban wetland park in Changshu, east China's Jiangsu Province, Nov. 15, 2022.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Yang Lei)

This aerial photo taken on Nov. 15, 2022 shows a view of the Shanghu national urban wetland park in Changshu, east China's Jiangsu Province.

An "international wetland city" from the Ramsar Convention, Changshu of Jiangsu Province boasts a total area of 29,921.61 hectares of wetlands. (Xinhua/Yang Lei)