Yunvyan is a marine site off Lanyu featuring a combination of reef top, drop-off, and wall topography. Divers typically explore depths between 10 and 25 metres, with an average depth of 20 metres. Visibility ranges from 10 to 25 metres, and the site is subject to moderate currents that can shift along the wall face. Access is exclusively by boat, requiring coordination with local operators due to sea conditions. Divers should remain alert for boat traffic when surfacing and be aware of potential hazards including sharp coral, stonefish in sandy areas, and jellyfish in the water column.

Wukungtung, or Five Caves, is a cavern and reef system on Lanyu suitable for advanced divers. The site features depths between 5 and 15 metres with an average of 12 metres. Divers can access the site from both shore and boat. Conditions include moderate currents and visibility ranging from 10 to 25 metres, though visibility can shift quickly within overhead sections. Due to the overhead environment, entanglement risks, and variable visibility, solid buoyancy control is required. Divers should carry two torches and run a guideline when entering cave passages. A local guide is strongly recommended for the first visit. Protective footwear is advised to avoid sharp rocks, coral, and sea urchins.

Located off Lanyu, Taiwan, the Kaiyuan Port Garden Eel Area is a reef site ranging from the surface to 16 metres. Divers experience visibility between 30 and 50 metres, allowing for clear observation of the reef structure. Water temperatures remain between 25 and 30 degrees Celsius throughout the year. Access is via a shore entry, which requires caution due to surf, sharp coral, and rocks underfoot. The site is suitable for beginners, though the current can be strong and requires constant attention. Night diving is permitted at this location. On-site facilities include parking, toilets, showers, and a dive shop.

Yeyou Port is a shore dive site in Lanyu, Taiwan, featuring a combination of natural reef and artificial reef structures. The site is suitable for beginners, with an average depth of approximately 4 metres. Divers can expect mild currents and visibility ranging from 10 to 30 metres. Water temperatures remain warm throughout the year, fluctuating between 25C and 30C. Due to the presence of sharp coral and active boat traffic in the area, divers should exercise caution during entry and exit. Typical dives at this location last around 30 minutes.

Yehyukang on the eastern coast of Lanyu features a combination of shallow reef, wall, and drop-off topography. The site reaches depths of 80 metres, though intermediate divers typically explore between 8 and 25 metres. Visibility ranges from 10 to 30 metres, with water temperatures between 24 and 27 degrees Celsius. Shore entry requires caution due to surge and swell, which can push divers onto sharp coral and rocks. Currents are moderate but can strengthen, so timing dives around slack water is recommended. Hazards include jellyfish, sea urchins, stonefish, and sharp coral. Species recorded around this area include sea kraits, regal angelfish, clown triggerfish, and various wrasses.

Yeyiu Fault is a dramatic wall and drop-off site on the Lanyu coastline, defined by a geological fracture that plunges from the surface to 100 metres. Shore entry provides quick access to the reef slope. Divers encounter moderate currents along the fault line, requiring careful planning to work with the flow. Visibility typically ranges from 10 to 30 metres, with water temperatures between 23 and 27 degrees Celsius. Due to the significant depth and potential for strong currents, this site is suited for intermediate divers. Species recorded around this area include sea kraits, clown triggerfish, regal angelfish, wrasses, and various nudibranchs. Divers should maintain strict buoyancy control and deploy a marker buoy.

Mujiyan is a reef site located 200 metres off Lanyu, Taiwan, featuring depths ranging from 1 to 20 metres with an average of 10 metres. The site offers visibility between 20 and 50 metres in water temperatures of 25 to 30 degrees Celsius. Access is possible via shore or boat, though divers must navigate sharp coral and potential surf. Due to variable currents that can strengthen without warning, careful planning and local advice are recommended. Species recorded around this area include sea kraits, clown triggerfish, regal angelfish, blackback anemonefish, and various wrasses. Divers should maintain buoyancy control to avoid contact with the reef structure.

Shuangshi is a reef and cave site located 1000 metres off Lanyu, Taiwan. The topography features open reef slopes combined with cave systems that create an overhead environment. Divers can expect depths ranging from 13 to 25 metres, with an average of 15 metres. Visibility is typically between 20 and 30 metres, and water temperatures fluctuate from 25C to 29C throughout the year. Due to strong and shifting currents, this site is restricted to advanced divers. Boat access is required, and surface marker buoys are essential. Divers must manage buoyancy carefully within the cave sections and remain aware of local boat traffic.