Jolong is a deep, quiet wall 700 m north of Cape Banks, the northern headland of Botany Bay, below the cliffs of the Kamay Botany Bay National Park with their WWII gun emplacements. The reef top lies at about 20 m, deepening to 23 m near the edge, and drops in one or two steps to 25–26 m; between there and a further drop to 28 m the bottom is sand, rocks and kelp, and beyond that it continues past 30 m. The wall has good overhangs and a few small cracks, with large boulders lying off it.

Growth is rich – sea tulips, sponges and gorgonians on the face – and the kelp on the slope shelters weedy seadragons and cuttlefish. Fish are the usual clean-coast assemblage: bream, luderick, yellowtail, silver sweep, black reef leatherjackets and one-spot pullers, with small rays on the sand. What distinguishes Jolong from the Royal National Park walls to the south is current: McFadyen notes it runs here far more often, which combined with the depth makes it an advanced dive best done on nitrox as the first of the day.

The shore opposite is Botany Bay National Park, and the adjacent Lilli Pilli Baths rock ledge has claimed many rock fishers' lives, a reminder of how swell rears on this shelf. No charter visits; it is a St George Scuba Club and private-boat site, twenty minutes from the Botany Bay ramps, and McFadyen rates it a very good location well worth repeated dives.

Private boat only. Launch in Botany Bay, run out through the heads, round Cape Banks and go 700 m north along the national park cliffs – under 10 minutes from the cape, 20–25 minutes from the Kyeemagh ramp. Anchor on the reef top at 20–23 m at the GPS mark.

No charter operator services this stretch.

Exposed open coast. Current is encountered here far more often than off the Royal National Park – expect it after periods of north-easterly weather and be ready to abort or drift. Seas under 1.5 m and westerly or light winds are ideal.

With the reef top at 20–23 m the constraint is bottom time (around 25 minutes) rather than swell; dive it first and use nitrox. The cliffs opposite include the Lilli Pilli Baths ledge, one of the most dangerous rock-fishing spots in NSW, which says everything about how swell behaves on this shelf.

Descend to the reef top at 20–23 m and drop over the wall to 25–26 m. Head north or south along the base for about 10 minutes looking at the overhangs and cracks and the large boulders off the wall, then backtrack shallower along the top. Do not go out to the 28–30 m second drop unless on nitrox.

Ascend the line with a long stop.

Nitrox 32 recommended.

No regular charter – private boat or dive-club (St George Scuba Club) only