An aerial drone photo taken on Sept. 3, 2025 shows the scenery of Dianchi Lake in Kunming City, southwest China's Yunnan Province. The water quality in Dianchi Lake has been maintaining on high quality level for eight consecutive years, according to the Dianchi Lake administration bureau. (Xinhua/Peng Yikai)

An aerial drone photo taken on Sept. 3, 2025 shows the scenery of Dianchi Lake in Kunming City, southwest China's Yunnan Province. The water quality in Dianchi Lake has been maintaining on high quality level for eight consecutive years, according to the Dianchi Lake administration bureau. (Xinhua/Peng Yikai)

People take a sightseeing ferry on the Dianchi Lake in Kunming City, southwest China's Yunnan Province, Jan. 22, 2026. The water quality in Dianchi Lake has been maintaining on high quality level for eight consecutive years, according to the Dianchi Lake administration bureau. (Xinhua/Peng Yikai)

Workers take care of plants on a floating island on the Dianchi Lake in Kunming City, southwest China's Yunnan Province, Jan. 22, 2026. The water quality in Dianchi Lake has been maintaining on high quality level for eight consecutive years, according to the Dianchi Lake administration bureau. (Xinhua/Peng Yikai)

An aerial drone photo taken on Jan. 22, 2026 shows the scenery of Dianchi Lake in Kunming City, southwest China's Yunnan Province. The water quality in Dianchi Lake has been maintaining on high quality level for eight consecutive years, according to the Dianchi Lake administration bureau. (Xinhua/Peng Yikai)

An aerial drone photo taken on Jan. 22, 2026 shows the scenery of Dianchi Lake in Kunming City, southwest China's Yunnan Province. The water quality in Dianchi Lake has been maintaining on high quality level for eight consecutive years, according to the Dianchi Lake administration bureau. (Xinhua/Peng Yikai)

An aerial drone photo taken on Jan. 22, 2026 shows the scenery of Dianchi Lake in Kunming City, southwest China's Yunnan Province. The water quality in Dianchi Lake has been maintaining on high quality level for eight consecutive years, according to the Dianchi Lake administration bureau. (Xinhua/Peng Yikai)

A woman feeds a black-headed gull beside the Dianchi Lake in Kunming City, southwest China's Yunnan Province, Jan. 22, 2026. The water quality in Dianchi Lake has been maintaining on high quality level for eight consecutive years, according to the Dianchi Lake administration bureau. (Xinhua/Peng Yikai)

A woman feeds black-headed gulls beside the Dianchi Lake in Kunming City, southwest China's Yunnan Province, Jan. 22, 2026. The water quality in Dianchi Lake has been maintaining on high quality level for eight consecutive years, according to the Dianchi Lake administration bureau. (Xinhua/Peng Yikai)