Locals enjoy their leisure time at the Caspian sea beach in Ramsar city, northern Iran, on July 31, 2019. (Photo by Ahmad Halabisaz/Xinhua)

Locals enjoy their leisure time at the Caspian sea beach in Ramsar city, northern Iran, on July 31, 2019. (Photo by Ahmad Halabisaz/Xinhua)

Locals enjoy their leisure time at the Caspian sea beach in Ramsar city, northern Iran, on July 31, 2019. (Photo by Ahmad Halabisaz/Xinhua)

Children play with sand at the Caspian sea beach in Ramsar city, northern Iran, on July 31, 2019. (Photo by Ahmad Halabisaz/Xinhua)

Locals enjoy their leisure time at the Caspian sea beach in Ramsar city, northern Iran, on July 31, 2019. (Photo by Ahmad Halabisaz/Xinhua)

Locals enjoy their leisure time at the Caspian sea beach in Ramsar city, northern Iran, on July 31, 2019. (Photo by Ahmad Halabisaz/Xinhua)