Island name in Thai is incorrect. For whatever reason, it's marked as "เกาะช่วง" which phonetically matches the romanization, but is inaccurate to the actual name of the island, which is "เกาะจวง".
This is my own knowledge, verified through Thai language Wikipedia:
https://th.wikipedia.org/wiki/%E0%B9%80%E0%B8%81%E0%B8%B2%E0%B8%B0%E0%B8%88%E0%B8%A7%E0%B8%87