Ko Sai (เกาะทราย) is one of the West Coast Islands of Thailand. This island lies off the western side of the Gulf of Siam, about 2 km away from the shore.
Ko Sai is the largest of a small group of three rocky islets also known as "Pran Rocks", located off the fishing village of Khao Takiab, just south of Hua Hin. All this area belongs administratively to the Prachuap Khiri Khan Province.
Ko Sai has a maximum length of 0.4 km and its highest point reaches 35 m. Ko Sai vaguely looks like a sitting lion when seen from the shore. Local tour operators call it "Lion Island" (Ko Singto) and organize regular sightseeing and snorkeling excursions to visit this island group.
Two smaller islets are located close to Ko Sai:
- Ko Sadao (เกาะสะเดา), it is located south of Ko Sai. Highest point 15m. This island is called "Ko Tao" (Turtle Island) by the travel agencies in the area, but it should not be confused with Ko Tao in Surat Thani Province.
- Ko Khi Nok (เกาะขี้นก), is the smallest of the group. It is located just a few hundred metres to the east of Ko Sadao. This is the lowest island and its name in Thai means "Guano Island". Its highest point is only 3 m and, unlike the other two islets, it barely has any vegetation. Ko Khi Nok is called "Ko Nok" (Bird Island) by the local tour organizers, but like the other alternative names above, it is not to be found in any official document.
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