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.

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.

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.

Kaiyuan Old Port is a shore-entry site in Lanyu, Taiwan, featuring a diverse topography of reefs, caves, and drop-offs. Located 300 metres from the shore, the site reaches depths between 13 and 34 metres, with an average depth of 15 metres. Divers and snorkellers can expect visibility ranging from 30 to 50 metres. Conditions are variable, with strong currents, surge, and potential boat traffic, making this site suitable for advanced divers. Facilities at the location include parking, toilets, showers, changing rooms, and a rinse station. Guided tours and boat charters are available through local dive shops.

Jade Maiden Rock is a reef and drop-off site located off Lanyu, Taiwan. The site reaches a maximum depth of 16 metres and is strictly for advanced divers due to persistent, strong currents that can shift direction without warning. Because of these challenging conditions, boat access is required and snorkelling is not an option. Divers should confirm visibility conditions locally before planning a dive. Water temperatures remain between 25 and 30 degrees Celsius throughout the year. The reef structure supports various marine life, including sea kraits, regal angelfish, clown triggerfish, Indian lionfish, and Chromodoris nudibranchs.

Uren Harbor is a sheltered bay on Lanyu, Taiwan, featuring a combination of shallow reef structures and seagrass beds. Divers can explore this site at depths ranging from 10 to 15 metres. The location offers visibility between 20 and 50 metres, providing clear views of the underwater topography. Water temperatures remain between 25 and 30 degrees Celsius throughout the year. Entry is via the shore, and divers should be prepared for moderate currents. Due to the presence of sharp coral and potential for entanglement with bottom growth, careful buoyancy control is required. The site is suitable for beginners, with typical dive times lasting approximately 45 minutes.