Coron Island is the third largest island in the Calamian Group of Islands in northern Palawan in the Philippines. The island is part of the larger municipality of the same name. It is about 170 nautical miles (310 km) southwest of Manila, is known for several Japanese shipwrecks World War II vintage. The island is part of the ancestral domain of the indigenous Tagbanwa people. The area around the wrecks have pleasant rock formations which provide for excellent snorkeling opportunities, with underwater visibility extending up to 80 feet (24 m).
The water is often calm. Coron is one of the most visited destinations for wreck diving in the Philippines. Wreck dive sites are found in a depth as shallow as 1030 feet and as deep as 120140 feet. Most are in the range of about 6080 feet, perfect for sports divers. Wreck diving sites in Coron Bay include the Irako wreck, Okikawa Maru wreck, Akitsushima wreck, Kogyo Maru wreck, Olympia Maru wreck, Kyokuzan Maru wreck, East Tangat gunboat wreck (the real name of the ship, Terukaze Maru, was recently discovered by a group of Dutch divers, who spent a couple of days digging into bottom sand around the stern), Nanshin Maru wreck, Lusong Gunboat Wreck, and Skeleton Wreck.