It's Maupiti Island, French Polynesia. I did, actually... but I never published it. My map Paradise Reef map https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1120166479&searchtext=paradise+reef and Sidai's Huahine map https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1489797763&searchtext=huahine are good maps that are islands not far from Maupiti, with similar of topography. They both have optional map themes that make your environment look like the picture of Maupiti. :)

Have you made that Atoll as one of your maps? It looks so beautiful