Yixiantian, located off Green Island, is a reef site defined by a narrow channel that funnels strong currents. This topography requires advanced skills in buoyancy and current management. Divers can explore depths reaching 50 metres, with boat access required for all entries. The reef walls host various marine life, including wrasses and snails, which are common. Divers may also encounter emperor angelfish, clown triggerfish, redtooth triggerfish, nembrotha nudibranchs, elongate clams, chromis, and sea squirts. Given the channel geometry, current direction and strength vary significantly, making it essential to consult with a local dive operator regarding conditions before entry.

Little Asia is a reef wall site off Green Island, Taiwan, that descends from the shallows to 60 metres. This site requires boat access and is suited for advanced divers due to strong, variable currents and significant depth. Divers must maintain solid buoyancy control while navigating the wall. Water temperatures range between 24 and 27 degrees Celsius throughout the year. Species recorded around this area include various wrasses, triggerfish, moray eels, and nudibranchs such as Chromodoris and Nembrotha. Always check current direction and tidal timing with your dive operator before entry, as conditions can shift rapidly. Be aware of potential entanglement risks near the reef structure and remain vigilant for boat traffic.

Chai Kou is a reef site located on Green Island, Taiwan, offering shore access suitable for beginners. The site features visibility ranging from 10 to 30 metres and water temperatures between 25 and 30 degrees Celsius. Divers and snorkellers should be aware of hazards including sea urchins, sharp coral, and surf. Entry requires navigating a shore break, so timing your movement during a lull is recommended. While the current is generally mild, conditions can include unpredictable surge or swell. Reef shoes or booties are advised for the shallow areas. Facilities at the site include parking and toilets.

Chaikou Snorkelling Area on Green Island features a shallow reef ranging from 1 to 10 metres in depth, with an average of 5 metres. This site is suitable for beginners, offering mild currents and visibility between 10 and 25 metres. Shore entry requires caution due to sharp coral, rocks, and sea urchins near the waterline; reef shoes or booties are strongly recommended. Snorkellers should time their entry to avoid the shore break. Water temperatures remain between 25 and 30 degrees Celsius. Hazards include stonefish on the seafloor and jellyfish in the water. Facilities include parking and a rinse station.

Confucius Rock is a marine dive site located on Green Island, Taiwan, featuring a combination of reef, cave, and cavern topography. Divers access the site from the shore by walking along a trail to the intertidal zone and crossing a lagoon. The site reaches depths between 5 and 28 metres. Conditions are variable, with strong currents possible, making this location suitable for intermediate divers. Night diving is permitted at this site. Water temperatures remain consistent throughout the year, ranging from 25C to 29C. It is recommended to plan entry during high tide for easier access to the water.

Zhongliao Port on Green Island, Taiwan, offers a shallow reef and muck diving environment suitable for beginners. Divers typically experience depths of 5 metres with mild currents and visibility ranging from 10 to 30 metres. Shore entry is standard for this site. Marine life recorded here includes wrasses, Indian lionfish, snowflake moray, and various nudibranchs such as Nembrotha and Trance Wrinkle Dorid. Other species observed include Ijima's sea snake, semicircle angelfish, striped surgeonfish, banded coral shrimp, porcupinefish, white-spotted puffer, and yellow boxfish. Hazards to consider include potential entanglement, variable visibility, and surf conditions. Typical dives last approximately 40 minutes.

Dory Reef is an offshore reef located 1000 metres from Green Island, Taiwan. The site features reef terrain ranging from 15 to 33 metres in depth, with an average depth of 17 metres. Divers must access this location by boat. Conditions include moderate currents that can shift with little warning, requiring divers to be comfortable with drift diving and buoyancy control. Visibility is typically between 20 and 40 metres. Due to the exposed nature of the site, surface conditions such as surge and swell can change quickly. Divers should coordinate closely with their boat operator and divemaster regarding current strength and pickup arrangements before entry.

Green Island Reef is a marine site featuring a reef and drop-off that descends from 10 to 40 metres. Divers experience visibility between 15 and 30 metres along the wall. Access is strictly by boat, and the site is suited for intermediate divers due to moderate currents and significant depths. Divers should maintain close proximity to the boat throughout the 45-minute dive. Species recorded around this area include wrasses, Ijima's sea snake, Clark's anemonefish, and various nudibranchs, angelfish, and triggerfish. Always check current conditions with your boat operator before descending, as water movement can accelerate significantly around the drop-off.