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Sometimes it seems likeluxury resorts are being developed in Thailand on a weekly basis. But among the handful that deserve the hype is Trisara—a collection of 33 stunning villas and 12 opulent "villa residences" on Phuket's overlooked northwest coast. Put together by ex-Amanpuri general manager Anthony Lark, Hong Kong-based entrepreneur and adventurer Simon Murray and Thai architect Mom Tridosoyudh Devakul, Trisara is set to become one of the most exclusive hideaways in the kingdom.

All villas feature infinity pools and ocean views. Guests have the use of a fleet of luxury motor yachts and an adjacent...