By name and location it is expected to be an area of large coral bommies or rock outcrops on the sand in the same 6–14 m depth band as the rest of Lighthouse Bay.

Lighthouse Bay reefs share a common character: limestone ridges, outcrops and cracks isolated in a sand desert, which act as a magnet for fish, turtles, sea snakes and reef sharks. Divers here can expect the same mix, and the site shares the bay's shelter from the prevailing south-westerly swell.

Confirm with Exmouth operators whether The Boulders is still in regular use and its exact location.

Planning notes: Open Water certification is recommended and the site is rated beginner. Expect to spend most of the dive around 10 m, with a maximum of about 14 m. Access is by boat only, and site selection depends on wind, swell and tide on the day. Best season: April–November (whale sharks March–July, humpbacks July–October, mantas year-round). Traffic: moderate (occasional charters/club dives).

From Exmouth, charters meet at the operator's shopfront or collect divers from accommodation and either launch at Bundegi boat ramp (about 14 km north of town on Murat Road, sealed, 2WD) or travel from Exmouth Marina (Mortimer Road, 2 km south of town). Lighthouse Bay sits just north of Vlamingh Head Lighthouse at the very tip of North West Cape, roughly 30–45 minutes by boat from Bundegi depending on sea state. Operators run double-dive days with a lunch break on board; sites are on public moorings installed to protect the reef, so the boat ties off and divers giant-stride from the back deck.

Lighthouse Bay is on the northern tip of the Cape and is sheltered from the prevailing south to south-westerly swell that hits the western side, which is why it is the fallback when the west side and Muirons are blown out. It becomes rough in strong northerly or north-easterly winds and in the afternoon south-westerly sea breeze that wraps around the Cape (often 15–25 knots from late spring to autumn), so trips run in the morning. Visibility is 5–20 m, dropping around the March–April coral spawn and during plankton blooms.

Cyclone season runs November to April; trips are cancelled for cyclone warnings. Tidal flow is noticeable around the Cape on springs.

Descend to the outcrops, weave between the boulders at 8–12 m and return to the mooring for a safety stop.

Dive Ningaloo – double boat dives several days a week, all certification levels including Discover Scuba; Exmouth Dive & Whalesharks Ningaloo – regular Lighthouse Bay trips; Ningaloo Whaleshark Swim (Whalesharks Exmouth) and Ningaloo Whaleshark-N-Dive – Lighthouse Bay dives as weather allows.