Port Noarlunga Aquatic Reserve
| Location | Port Noarlunga Reef Aquatic Reserve |
| Start/End Point | Port Noarlunga Jetty |
| Distance | 800 m underwater trail |
| Difficulty | Easy |
| Activity | Scuba Diving, Snorkelling |
| Region | Adelaide & Adelaide Hills |
| Accommodation | Camping, mid-range and premium options — See accommodation options |
| Key Feature | 12 underwater markers, 200+ marine species, South Australia’s best-known reef |
| Visitors | 170,000+ per year |
South Australia’s Most Popular Underwater Trail
Port Noarlunga Reef Aquatic Reserve is South Australia’s most intensively used and best known aquatic reserve — more than 170,000 visitors each year come to experience the marine environment through diving, snorkelling, and a range of aquatic activities. Established in 1994, the underwater dive trail was created to increase understanding and enjoyment of the temperate reef system that lies just offshore from the Port Noarlunga Jetty. With twelve underwater markers providing information about the reef and its inhabitants, this is not just a dive site — it is an underwater classroom.
The reef is home to more than 200 species of marine plants and animals and more than 50 species of fish. This extraordinary biodiversity within easy reach of Adelaide makes Port Noarlunga one of the most important marine education sites in the state. It is also a major focus for scuba diving training — over a thousand divers visit the reef each summer, and for many South Australian divers, Port Noarlunga is where they took their first breath underwater.
The Dive Trail
The trail consists of twelve numbered underwater markers, each containing information about the reef and the marine life visible from that point. Seven markers are placed on the inside (beach side) of the reef, number eight is positioned in the ‘Gap’ — a natural break in the reef structure — and four further markers can be explored on the outside (sea side) of the reef. The markers guide divers and snorkellers on a journey through the reef’s different zones, from the sheltered lagoon inside the reef to the more exposed ocean-facing edge.
The best access to the reef is via the third set of steps along the jetty — the steps furthest from shore. The jetty is approximately 300 metres long, so a trolley is recommended for scuba divers to transport their equipment. The easy rating makes this accessible to newly certified divers and snorkellers, while the diversity of marine life keeps experienced divers returning.
Planning Your Dive
Port Noarlunga is easily accessible from Adelaide, located approximately 30 kilometres south of the CBD. The reef is accessible year-round, though summer months offer the warmest water temperatures and best visibility. Parking is available near the jetty. Bring a lock to secure your equipment trolley on the jetty. Snorkellers can explore the inside of the reef without scuba equipment, making this an accessible marine experience for non-divers as well.
Port Noarlunga Reef is where South Australia meets the sea — an underwater world of extraordinary diversity just a jetty-walk from the beach. The twelve-marker trail transforms a dive or snorkel into an education, revealing the complexity and beauty of a temperate reef system that has been teaching people to love the ocean for over thirty years.
Explore More Dive Sites
Aldinga Pinnacles — One of South Australia’s best shore dives, with reef pinnacles and leafy sea dragons.
Glenelg Tyre Reef — An artificial reef dive site off Glenelg beach, popular with beginners.
Aldinga Drop Off — A dramatic reef edge dive site near Aldinga Beach on the Fleurieu Peninsula.
Where to Stay
Planning an overnight trip? See our Adelaide Hills Accommodation Guide for the best places to stay near this trail.