Similan" is derived from the Malay sembilan, and means "nine". Each of the Similan Islands has a name. These are, running from north to south: Koh Ba Ngu , Similan , Payu , Miang , Payan , Payang , and Hu Yong . Hin Pousar, or "Elephant Head Rock", is alternatively designated by some. Koh Bon, lying 17 nautical miles north of Ba Ngu