Little Armstrong Bay on Rottnest Island offers a sheltered shore entry dive suitable for beginners. The site features a reef and cave topography with depths ranging from 6 to 7 metres, averaging 4 metres. Divers benefit from mild currents and visibility typically between 15 and 20 metres. Water temperatures fluctuate between 19C and 23C, necessitating appropriate thermal protection year-round. The bay is protected from waves and winds, providing a stable environment for underwater exploration. Divers should remain aware of potential boat traffic in the area. Conditions are most settled during the spring and autumn months.

The City of York is a historic wreck located 200 metres offshore at Rottnest Island. Resting in shallow waters between 4 and 9 metres deep, this site is suitable for beginners. Divers explore the wreck structure and surrounding reef, which feature sponges and various marine life including crayfish, Western Blue Devil, Western Dhufish, Western King Wrasse, and Australian Giant Cuttlefish. Conditions are generally manageable with a mild current, though visibility varies significantly from 3 to 20 metres depending on weather. Boat access is required to reach the site. Divers should exercise caution regarding sharp coral and potential entanglement hazards within the wreck structure, while also monitoring surf conditions before entry.

Parakeet Bay on Rottnest Island is a sheltered shore-accessible site featuring a diverse mix of reef, seagrass beds, and kelp forest. With depths ranging from 1 to 4 metres and an average of 2 metres, the site is well-suited for beginners. The bay is protected from prevailing winds, providing calm conditions and minimal current. Visibility can reach up to 30 metres, though it varies. Visitors should exercise caution near the limestone cliffs, which are unstable and prone to collapse. The site is best accessed in the morning to take advantage of settled conditions before afternoon winds develop.

Geordie Bay on Rottnest Island provides an accessible shore entry from a sandy beach, suitable for beginners. The site features a transition from seagrass beds to reef structures, with small cave and cavern formations. Depths range from 0 to 16 metres, and the area is generally sheltered with mild currents. Snorkelers should remain vigilant for boat traffic, as the bay is a popular anchorage, and be aware of jellyfish in the shallows. Facilities including toilets and a cafe are located near the beach. Water temperatures are influenced by the Leeuwin Current, ranging between 19C and 23C throughout the year.

Roe Reef, located 1500 metres off Rottnest Island, is a boat-accessible site featuring a mix of reef and cave topography. Divers and snorkellers can explore depths ranging from 8 to 18 metres, with visibility typically between 10 and 25 metres. The site is suitable for beginners, though conditions require careful assessment as currents can reach 2 knots and surge is common. Water temperatures fluctuate between 19C and 23C, with potential for thermoclines. Species recorded around this area include various wrasses, nudibranchs, rays, and butterflyfish. Due to the exposure to wind and swell, morning dives are recommended when conditions are calm.

Rottnest Island features a diverse underwater landscape consisting of walls, caves, reefs, drop-offs, and a wreck. Accessible only by boat, the site offers depths ranging from 2 to 26 metres with an average of 10 metres. Divers should be prepared for moderate currents and variable visibility between 3 and 30 metres. Water temperatures fluctuate between 19C and 23C, with cold currents and thermoclines possible at North Point. Hazards include boat traffic, jellyfish, surf, surge, and strong currents. The site is suitable for intermediate divers, with facilities available for air fills, equipment rental, and guided tours. Night diving is permitted, and typical dive times are approximately 50 minutes.

Swirl Reef at Rottnest Island offers a varied underwater landscape featuring both reef structures and cave sections. Divers can explore depths ranging from 4 to 24 metres, with an average depth of 15 metres. Access is strictly by boat, located 1600 metres from the shore. Conditions are variable, with visibility fluctuating between 3 and 20 metres and shifting currents. The site is suited for intermediate divers who can manage surge near cave openings. Hazards include sharp coral, which requires careful buoyancy control and attention to hand placement. Typical dives last approximately 50 minutes. Divers should remain mindful of surge during boat entry and exit procedures.

The Basin is a sheltered reef and seagrass site located at Rottnest Island, Australia. With depths ranging from 1 to 10 metres and an average of 3 metres, it is well-suited for beginner divers and snorkellers. The site is protected from most winds, maintaining mild currents and visibility between 15 and 30 metres. Water temperatures are influenced by the Leeuwin Current, remaining warmer than the mainland coast. Shore access is straightforward, supported by on-site facilities including parking, toilets, showers, and a rinse station. Divers should remain aware of potential surface chop from afternoon sea breezes and the presence of other water users in this popular area.