Ko Bon (เกาะบอน) is a small island to the south of Phuket.
Koh Bon is 47km from the mainland and at least 20km from the next nearest islands, which are also uninhabited. The only way to travel to Koh Bon is on a diving or snorkel boat that offers day trips or liveaboard cruises. There are no public ferries. A speedboat ride from Tab Lamu Pier takes at least one hour.
Koh Bon is best known for its amazing underwater marine life. Manta Rays are often seen here, especially in March. There are two main diving areas, which are the ridge/bay (suitable for all levels of scuba diver) and Koh Bon Pinnacle, which is deep and prone to currents, and therefore only suitable for experienced scuba divers.
The island has no beach, and is most-commonly visited by scuba diving liveaboard boats which off Similan diving tours from Khao Lak or Phuket. It's also suitable for one-day tours for scuba diving, but only from Khao Lak. Snorkelling at Koh Bon is possible, but snorkellers are more likely to enjoy the Similan Islands.
There are no business offering food or drinks on Koh Bon. It's an uninhabited island 45km from the nearest part of Thailand's mainland. Visitors come on day trip or liveaboard diving boats and must bring their own food & drinks.
There are no restaurants, shops or bars on Koh Bon. Some sneaky companies suggest that there is, by pasting their name but not their website url.