List of corals of the Houtman Abrolhos
The marine waters of the Houtman Abrolhos, an island chain off the coast of Western Australia, have been recorded as containing 194 species of coral in 50 genera. This is a surprisingly high coral diversity, considering the high latitude of the reef, and the relatively low diversity of other biota. This is a list of corals of the Houtman Abrolhos:
North Island (Houtman Abrolhos)
On the eastern side is a seasonally inhabited permanent fishers' camp. There is an unnamed lighthouse on the western side, a trig point on the eastern side, and a gravel airstrip near the centre.
The island is surrounded by a coral reef flat. This extends about  km (1 mi) to the west of the island, and over 3 km (2 mi) to the north and south, but the reef margin lies quite close to the island on the eastern side. Most of the reef is not navigable, but a passage through the reef just north of the island is named Suda Bay Passage; one just south of the island is named Barker Passage; and there are a few breaks or channels on the eastern side of the island where boats may obtain shelter in bad weather. An area of reef immediately north of the island is named The Flat, and at the northern extreme of the reef is a breaker named The Big Breaker. About 200 m (660 ft) west of the island is a small rock informally known as "Shag Rock", but with no official name; it differs from Shag Rock in the Wallabi Group further south.