The top 10 beaches with the cleanest sea water are: Bang Ben (Ranong) Kai Bae (Trad) Sai Kaew (Rayong) Chaweng Noi (Surat Thani) Hin Ngam (Nakhon Si Thammarat) Pak Bara (Satun) Chan Damri (Ranong) Pak Kor (Phan Nga) More items... Apr 7, 2023