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Green Island is a tropical island located in the north-flowing channel of the Japan Current, and is particularly rich in marine species. Fish, shellfish, and coral give the most striking indication of this abundance, and sea snakes, sea turtles, and other vertebrates are also seen there in large numbers.
Surveys show that the island is home to more than 300 species of fish, with reef fish being the most abundant. Most of these fish are brightly colored in complicated patterns; and the sight of these beautiful fish flitting among the coral, which itself vies for attention with a multitude of shapes and shades, forms a wildly colorful undersea tableau.
Warm and clear sea water provides an ideal environment for the growth of coral. Green Island is surrounded by this kind of excellent ocean environment, and thus has produced a beautiful world of coral. There are a large number of coral, shellfish, and crustacean species here, with particularly large quantities of small shellfish along the shoreline. More than four species of sea snakes thrive in the waters off the western side of the island. They have a gentle nature but are also equipped with strong poison, so skin divers should keep a safe distance from them.
If you want to observe the fascinating underwater world of Green Island, you have a variety of choices. You don't even have to get wet; you can take a glass-bottom boat, a semi-submersible, or a fully submersible tourist submarine. If you have been properly trained, you can attach a scuba tank and become a part of the underwater world yourself. There are skin-diving areas and basic facilities at Chaikou, Dabaisha, and Nanliao. Diving shops on the island can rent you the equipment you need and arrange diving activities for you.