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        Thai Diving Tourism Association (TDTA) was founded in 2004 by a group of dive instructors, travel agencies and dive shops. The purpose of TDTA is to be the center in providing information and promote diving activities and dive sites in Thailand including Similan, Koh Tao, Koh Chang, Koh Samui, Chumporn, Pattaya, Phuket, etc. TDTA also actively coordinates relating diving and tourism businesses and organizations to facilitate its members and tourists.