It lies 26km NNE of Swallow Reef, and 9km east of Dallas Reef, with the large Ardasier Bank extending 69km ENE. Ardasier Bank, a sunken atoll except for drying Ardasier Reef at its southwestern end, has a total area of 2347km2, and its former lagoon is up to 65 metres deep.[2]
Ardasier Reef is steep-to, except on its eastern side where it adjoins the Ardasier Bank. Its huge areas of sandy patches have an abundance of shy Guitar Sharks, Eagle Rays, Giant Reef Rays and other intriguing bottom dwelling creatures that bury themselves in the sand.
