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According to Richard Barrow's Twitter account (mirror 1, mirror 2) on 2020-06-02:
Although Phuket has opened its land and sea borders, itβs not the best time to visit as there is a mandatory 14-day quarantine on visitors arriving from eight risky provinces -- Bangkok, Nonthaburi, Narathiwat, Yala, Krabi, Prachin Buri, Samut Prakan and Chiang Mai.