Coral Kingdom is exactly what its name promises: one of the best hard-coral gardens on the Ribbon Reefs. It lies between Ribbon Reefs No. 9 and 10 on a gently falling slope, and Mike Ball's photographers' guide describes prolific gardens of densely packed branching Acropora in every colour, massive boulder corals and stunning reef flats. It is a regular stop on Mike Ball's Cod Hole and Coral Sea trips, which describe staghorn beds, giant clams, parrotfish and barracuda.

The dive is shallow and bright. Most of the interest is in the top 12 m, where the staghorn and plate corals form a dense maze. Blue-green chromis and damselfish hover above every branching colony, and trumpetfish shadow coral trout, using them as cover to ambush prey. Juvenile palette surgeonfish tuck into coral clusters, and cuttlefish, often in groups of one to five, patrol the slope and display to divers.

Larger animals include schools of bumphead parrotfish grazing in the early mornings, whitetip reef sharks and spotted lagoon rays on the sand, barramundi cod and moray eels under ledges, and diagonal-banded and giant sweetlips. In summer manta rays pass by, and in winter eagle rays. Nudibranchs, including Notodoris gardineri and Flabellina exoplata, are common on the reef.

Mike Ball's itinerary materials sometimes pair the site with neighbouring Goggle Gardens. For a diver who wants to see what a healthy, recovering outer-reef coral garden looks like, it is one of the most satisfying dives on the Ribbons, and excellent for snorkellers. Keep well clear of the fragile branching colonies; fin damage in the shallows is the main threat to its recovery.

Liveaboard only (or fly-dive via Lizard Island). Mike Ball Dive Expeditions' Spoilsport and Spirit of Freedom depart Cairns (Trinity Wharf / Marlin Marina) in the evening and steam north overnight, roughly 12–14 hours and 200–250 km, to reach the Ribbon Reefs by morning; some itineraries fly Cairns–Lizard Island (about one hour, scenic flight along the coast) and board or disembark there. Trips run 3–7 nights and include Coral Kingdom on Cod Hole and Coral Sea itineraries.

Divers enter by giant stride from the dive deck at the mooring and descend the mooring line. The shallow garden lies close to the mooring and is dived and snorkelled straight from the boat.

The Ribbon Reefs sit on the edge of the continental shelf and take the full south-east trade wind from April to October. Lagoon-side moorings stay diveable in 20–25 knot SE winds, but reef-front sites and passes need lighter winds; liveaboards shelter behind the reefs overnight. September to December is usually calmest.

Tidal flow through the gaps between the Ribbons is strong on springs, so exposed pinnacles are timed for slack water. December to April brings rain, lower visibility and cyclone risk; box jellyfish and Irukandji are possible November to May. Coral Kingdom is best on calm, sunny days when light rays stream through the shallows; in rougher conditions the surge makes photography harder.

Descend to 12–15 m at the base of the slope, work along it looking for cuttlefish, then zig-zag up through the gardens and finish with a long shallow section over the reef flat at 3–5 m. Early morning is best for bumphead parrotfish.

Mike Ball Dive Expeditions (Spoilsport) – regular on Ribbon Reef, Cod Hole and Coral Sea itineraries.