Koh Khai Nok is a very small island in the Andaman Sea, located just about 10 kilometers to the east of Koh Sirey Island off Phuket’s East coast and 8 km. west of Koh Yao Yai Island. It is part of a group of two islands also including Khai Nai Island. Koh Khai Nok is just 200 meters long, and roughly in the shape of a seahorse.
Departure point on Phuket is at the Pier Rassada just to the east of Phuket Town on Phuket Island near Koh Sirey Island. A speedboat trip from Phuket Island typically leaves in the morning and takes between 30 and 40 minutes, depending on the height of the sea’s waves (worse between May and November). To reach Rassada Pier from Patong Beach, travel on Highway 4029 over the mountain toward Phuket Town and then to Anuphas Phuket Karn Road down to Rassada Pier.