Sankuaishih is a marine dive site off the coast of Lanyu, Taiwan, featuring a shallow reef top that transitions into a wall and drop-off. The topography descends from 5 metres to depths exceeding 30 metres, with an average depth of 20 metres. Divers encounter moderate currents that require solid buoyancy control. Visibility is variable, ranging from 20 to 50 metres. Access is by boat only, and the site is suitable for intermediate divers. Night diving is available through local operators. Due to the potential for strong currents and boat traffic, divers should maintain awareness of their surroundings and plan their dives to work into the current.

The Badaiwan Wreck is an artificial reef located off Lanyu, Taiwan, resting at depths between 20 and 38 metres. This site is suited for advanced divers due to the overhead environment, potential for strong currents, and deep profile. Visibility ranges from 20 to 50 metres, allowing for clear views of the structure. Access is by boat only. Divers must manage buoyancy carefully to avoid entanglement risks within the wreck. A dive torch is essential for penetration and night diving. Water temperatures remain between 25 and 29 degrees Celsius throughout the year, typically requiring a 3 mm wetsuit.

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.

Green Field is a boat-access dive site off Lanyu, Taiwan, characterised by shallow reef terrain. The site features a wall that extends to 70 metres, requiring divers to monitor their depth gauge closely. Conditions are variable, with strong currents that can shift quickly and push divers off the reef. Marine life recorded at the site includes wrasses, groupers, Pacific Orange-spine Unicornfish, rock cod, Powder-blue Surgeonfish, Striped Surgeonfish, Bird Wrasse, Moorish Idol, Indo-Pacific Sergeant Major, hawkfish, Lined Bristletooth, and snails. Due to the potential for strong currents and the depth of the wall, this site is suitable for intermediate divers who possess strong buoyancy control.

Jichangwaijiao is a reef site located off the coast of Lanyu, Taiwan, offering diving from the surface to a depth of 30 metres. Access is exclusively by boat, and the site is known for strong currents that require careful planning around slack water. Water temperatures remain between 25 and 29 degrees Celsius throughout the year. Visibility is variable, and divers should remain aware of boat traffic when surfacing. Species recorded around this area include sea kraits, regal angelfish, clown triggerfish, nudibranchs, and various wrasses. Due to the challenging current conditions, this site is best suited for experienced divers who can manage variable underwater environments.

Sitiaogou is a deep reef and canyon system located off Lanyu, Taiwan, characterised by complex topography and strong currents. This site is strictly for advanced divers, with depths ranging from 25 to 42 metres and an average depth of 30 metres. Divers experience high visibility between 30 and 50 metres in water temperatures of 25 to 29C. Due to the strong currents and overhead environments within the canyons, boat access is required for all entries. The site is suitable for drift diving and night diving, though navigation is demanding. Divers should plan entries around slack tide to manage the flow through the canyon structures.

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.

Lungmenkang is a coastal site on Lanyu, Taiwan, featuring a combination of natural reef and artificial reef structures. The site is suitable for beginners, with depths ranging from 5 to 13 metres and an average depth of 10 metres. Visibility is high, typically between 30 and 50 metres. Divers access the site from the shore, though the entry requires careful planning due to surf and shore break conditions. Moderate currents are present, and divers should remain alert for boat traffic. Water temperatures remain between 25 and 30 degrees Celsius throughout the year. Species recorded around this area include sea kraits, various wrasses, surgeonfish, and triggerfish.