Coral Corner, on the north-western tip of Split Solitary Island, is often cited as the clearest single demonstration in the whole Solitary Islands Marine Park of the overlap between tropical and temperate marine ecosystems that makes this stretch of the NSW coast so unusual. The terrain here is generally flatter than the rest of the island, shaped into a series of small bays separated by rocky headlands, with depths running a gentle 10-15 m and occasional deeper pockets to about 18 m. What makes the site distinctive is the close juxtaposition of kelp beds — a distinctly temperate, cool-water habitat — growing in water as shallow as 18 m alongside profuse growths of plate coral, in places only a few metres apart, a combination that would be unusual almost anywhere else on the Australian coast.

Coral life is abundant within the sheltered bays themselves, while the rocky headlands separating them support a denser invertebrate community, and turtles are commonly found resting in the shallows between dives. Because the terrain is gentle and current is generally mild, Coral Corner is an easy, approachable dive suited to less experienced divers, and its combination of coral gardens and kelp forest in a single dive gives it genuine interest for anyone curious about the biogeography of this transition zone between the tropical Great Barrier Reef province to the north and the cooler temperate reefs of southern NSW. It is regularly worked into a day's diving at Split Solitary Island alongside the more turtle- and macro-focused southern sites.

Jetty Dive Centre departs from the public floating pontoon wharf in Coffs Harbour boat harbour, opposite the Attitude Burgers building (check in at 398 Harbour Drive). Private boats use the public ramp inside the harbour breakwall. Split Solitary Island is the closest of the group, about 9 km east-north-east of Coffs Harbour, roughly a 20-minute run — the standard backup site when weather rules out South Solitary Island.

Conditions off Coffs Harbour depend heavily on which island is being run: North West Solitary and Split Solitary sit closer inshore and are usable in more marginal weather, while South Solitary and any northern sites need a bigger settled window. Visibility across the group is generally 8-25 m and best away from river influence; the Coffs, Bellinger, Nambucca and Clarence systems all periodically dirty inshore water for a few days after heavy rain. Summer (Nov-Apr) is warmest with tropical vagrants and mantas; winter (May-Oct) is cooler with grey nurse sharks and giant cuttlefish.

Humpback whales pass April-November. Being the closest and most sheltered island, Split Solitary is the most reliably diveable site in the group, though visibility is often lower than at South Solitary Island since it sits closer to the mainland's influence.

Descend onto the flatter terrain at 10-12 m, move between the small bays separated by rocky headlands looking for plate coral growths only a few metres apart, check the deeper kelp beds around 18 m, and shallow up over the headlands to the ascent point.

Jetty Dive Centre runs Split Solitary Island daily as either the main destination on rougher days or a second dive after South Solitary Island; also used extensively for training and check-out dives.