People enjoy themselves at the seaside in Nice, southern France, on July 22, 2020. Many visitors crowd Nice during the summer vacation season amid the COVID-19 pandemic. (Photo by Serge Haouzi/Xinhua)

People enjoy themselves at the seaside in Nice, southern France, on July 22, 2020. Many visitors crowd Nice during the summer vacation season amid the COVID-19 pandemic. (Photo by Serge Haouzi/Xinhua)

People enjoy themselves at the seaside in Nice, southern France, on July 22, 2020. Many visitors crowd Nice during the summer vacation season amid the COVID-19 pandemic. (Photo by Serge Haouzi/Xinhua)

People enjoy themselves at the seaside in Nice, southern France, on July 22, 2020. Many visitors crowd Nice during the summer vacation season amid the COVID-19 pandemic. (Photo by Serge Haouzi/Xinhua)

People enjoy themselves at the seaside in Nice, southern France, on July 22, 2020. Many visitors crowd Nice during the summer vacation season amid the COVID-19 pandemic. (Photo by Serge Haouzi/Xinhua)

People enjoy themselves at the seaside in Nice, southern France, on July 22, 2020. Many visitors crowd Nice during the summer vacation season amid the COVID-19 pandemic. (Photo by Serge Haouzi/Xinhua)

People enjoy themselves at the seaside in Nice, southern France, on July 22, 2020. Many visitors crowd Nice during the summer vacation season amid the COVID-19 pandemic. (Photo by Serge Haouzi/Xinhua)

People enjoy themselves at the seaside in Nice, southern France, on July 22, 2020. Many visitors crowd Nice during the summer vacation season amid the COVID-19 pandemic. (Photo by Serge Haouzi/Xinhua)

A boy cools off at a fountain in Nice, southern France, on July 22, 2020. Many visitors crowd Nice during the summer vacation season amid the COVID-19 pandemic. (Photo by Serge Haouzi/Xinhua)