Aerial photo taken on May 31, 2020 shows a view of Yingzhou park in Hejian City, north China's Hebei Province. Hejian built the Yingzhou park on an abandoned pond on the outskirts of the city, which has become a scenic spot for citizens and tourists. (Xinhua/Zhu Xudong)

Aerial photo taken on May 31, 2020 shows a view of Yingzhou park in Hejian City, north China's Hebei Province. Hejian built the Yingzhou park on an abandoned pond on the outskirts of the city, which has become a scenic spot for citizens and tourists. (Xinhua/Zhu Xudong)

Aerial photo taken on May 31, 2020 shows a view of Yingzhou park in Hejian City, north China's Hebei Province. Hejian built the Yingzhou park on an abandoned pond on the outskirts of the city, which has become a scenic spot for citizens and tourists. (Xinhua/Zhu Xudong)

Aerial photo taken on May 31, 2020 shows a view of Yingzhou park in Hejian City, north China's Hebei Province. Hejian built the Yingzhou park on an abandoned pond on the outskirts of the city, which has become a scenic spot for citizens and tourists. (Xinhua/Zhu Xudong)

Aerial photo taken on May 31, 2020 shows a view of Yingzhou park in Hejian City, north China's Hebei Province. Hejian built the Yingzhou park on an abandoned pond on the outskirts of the city, which has become a scenic spot for citizens and tourists. (Xinhua/Zhu Xudong)

Aerial photo taken on May 31, 2020 shows a view of Yingzhou park in Hejian City, north China's Hebei Province. Hejian built the Yingzhou park on an abandoned pond on the outskirts of the city, which has become a scenic spot for citizens and tourists. (Xinhua/Zhu Xudong)