Lennox Reef is named and mapped separately from the broader Black Head reef complex to its south, sitting on the stretch of coast between Ballina and Lennox Point proper, though in practice the two are dived as a continuous system by the handful of private boats and club divers who make the trip out from the Richmond River. The reef structure continues the same broken rock, ledge and gutter pattern found along this section of coast, in a comfortable 8 to 20 m depth range that keeps it accessible without any particular technical demands beyond general reef-diving competence. As with the neighbouring Black Head grounds, the main draw for local divers is the seasonal chance of grey nurse sharks moving along this stretch of coast between the aggregation sites further north at Tweed/Nine Mile Reef and further south toward the Solitary Islands, along with turtles, wobbegong sharks and a typical subtropical reef fish community of kingfish, snapper and mulloway working the structure.

Because the site sits a little further from the river mouth than the closer Black Head reefs, it sees even less regular attention, making sightings here feel correspondingly more exclusive when conditions align. Access follows the same pattern as the rest of Ballina's diving: no resident dive shop, a private boat or club connection required, and a crossing of the sometimes-hazardous Ballina bar before reaching open water. Documentation of Lennox Reef as a distinct site from the broader Black Head system is limited, and the boundary between the two is more a matter of local convention than a formally marked feature, so prospective divers should treat the description here as indicative of the general character of this stretch of coast rather than a precisely bounded, independently verified site.

Ballina has no permanent full-service dive centre, so diving here is mostly private-boat or club-organised. Boats launch at the Ballina Fishermen's Co-op ramp or the public ramp on the Richmond River, then cross the Ballina bar — a notoriously changeable bar that should only be attempted by those experienced with it, in settled conditions and a rising or high tide. Lennox Reef sits between the Black Head reefs and Lennox Point proper, a short additional run north of the more commonly dived Black Head grounds.

This stretch of coast is exposed to easterly and south-easterly swell year-round, and the Ballina bar itself can close to small boats in a moderate swell or on an outgoing tide. Visibility degrades for days after Richmond River floods. Winter gives the clearest water and the best chance of grey nurse sharks.

Drop onto the reef at 8-12 m, work the ledges and gutters toward Lennox Point looking for turtles and grey nurse sharks, and return shallow along the reef top for the ascent.

No dedicated charter; dived occasionally by private boats and local clubs from Ballina as an extension of a Black Head trip.