Greece's Blue Flag certified beaches reopen to tourists
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People sunbathe along the beaches of Glyfada, a southern suburb of Athens, Greece, May 20, 2021. (Xinhua/Marios Lolos)

People sunbathe along the beaches of Glyfada, a southern suburb of Athens, Greece, May 20, 2021. (Xinhua/Marios Lolos)

People sunbathe along the beaches of Glyfada, a southern suburb of Athens, Greece, May 20, 2021. (Xinhua/Marios Lolos)

People sunbathe along the beaches of Glyfada, a southern suburb of Athens, Greece, May 20, 2021. (Xinhua/Marios Lolos)

People sunbathe along the beaches of Glyfada, a southern suburb of Athens, Greece, May 20, 2021. (Xinhua/Marios Lolos)