Halls Reef is one of the inshore reefs of Laguna Bay, close to the Noosa River mouth. The Noosa fishing charter Deep Sea Fishing Co gives its position as 26°20.250'S 153°05.110'E, about 2 km from the Noosa bar, with depths of 15-20 m, and notes that its proximity to the river mouth brings bait flushed out by freshwater discharge. The Noosa kayak-fishing community lists the same mark.

It is primarily a fishing reef, and there is little published dive information. Based on its depth and position, it is a lower-profile rocky reef than Jew Shoal, with the same subtropical mix of soft corals, sponges and reef fish, and occasional pelagics following the bait. Its closeness to the river makes visibility more variable than at Jew Shoal – worse after rain and on the ebb, better on a flood tide in dry weather.

In practice, divers visiting Noosa will do Jew Shoal with SubSurface Scuba, which advertises 'two other local reefs' on its triple-dive trips without naming them; Halls may be one of those, but that is not confirmed. For divers with their own boat or a dive kayak, it is a short run from the bar and a reasonable option on calm days.

Because it is a popular fishing mark, expect anglers on the reef on good days, and take care with line and anchors. Plan dives for a rising tide and calm, dry weather to get the best out of the site.

Noosa's reefs are reached by boat. SubSurface Scuba runs Jew Shoal double and triple dives (about 20 minutes' boat ride to the shoal). Private boats launch at the Noosa River ramps (Noosaville/Munna Point or Tewantin) and must cross the Noosa River bar at the river mouth beside Noosa Heads – a shallow, shifting bar that is hazardous in any swell and best crossed on a rising tide in daylight.

Halls Reef lies about 2 km from the Noosa bar at 26°20.250'S 153°05.110'E – a 5-10 minute run. Anchor in sand off the reef.

Laguna Bay faces north and is sheltered by the Noosa headland from south-easterly winds and swell, which is why the inshore Noosa reefs are often diveable when the rest of the Sunshine Coast is blown out. North-easterly and northerly winds and swell, common on summer afternoons, make the bay choppy and surge over the shallow reef. The Noosa River bar closes in moderate swell.

Visibility is typically 8-15 m and drops after rain because of the Noosa River plume, particularly on the ebb tide – dive on the flood. Winter (May-October) brings clearer water and occasional grey nurse sharks and mantas; summer is warmer with leopard sharks.

Anchor off the reef, descend to 15-17 m and swim a loop along the reef edge, returning to the anchor on a third of your gas. Dive on the flood tide for cleaner water.

No regular dive operator documented – private boat or kayak divers; SubSurface Scuba may include 'other local reefs' on Noosa triple-dive trips.