On the north side of Perth, the snorkeling at the Marmion Marine Park is known for scenic reefs providing habitat to diverse marine life. During Marmion Marine Park snorkeling you may encounter sea lions, bottlenose dolphins, humpback whale and southern right whales migrating. The sea lions are often found resting on Burns Rocks and Little Island.
The best snorkeling dive sites are Boyinaboat Reef and Mettams Pool. The boat-accessed Boyinaboat Reef is located about 200 feet off Hillarys Boat Harbour in waters of 18 feet deep. While snorkeling Boyinaboat Reef, you may encounter wrasse, old wives, sea stars, blue devilfish, lionfish, morwong and cardinalfish. The Mettams Pool is a shore-accessed snorkeling site in a protected lagoon of about 6 feet deep. This dive site is very family-friendly and good for beginners.
The Marion Marine Park is located north of Perth between Burns Beach and Trigg Island. The sanctuary zones are clearly marked by yellow buoys.
Overall, Marmion Marine Park is the 2nd most popular snorkel dive spot of all 24 snorkeling dives in Western Australia.