Ang Thong National Marine Park
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Category
6 diving and snorkeling across 5 provinces, grouped by region.
Provinces with diving and snorkeling: Surat Thani, Satun, Trang, Krabi, Phang Nga.
Choosing an island? Check Andaman vs Gulf: which coast when for your month.
Often combined with: islands, beaches, national parks.
Southern Thailand: Ang Thong National Marine Park, Ko Lipe, Ko Ngai, Ko Phi Phi, Ko Tao, Similan Islands.
It depends on the region. Gulf coast (Samui, Pha Ngan, Tao, Songkhla): Feb to Apr. Andaman coast (Phuket, Krabi, Trang, Satun): Dec to Mar.