Banc Capel is a guyot, or flat-topped underwater volcano, in the Coral Sea.

Banc Capel is a guyot – a former atoll with steep sides and a flat top – and is swept by strong currents.

There are no sandy or muddy substrates, the surface being occupied by rocks or gravel scree.

[2] Banc Capel is inhabited by species including Nassarius alabasteroides and Laurentaeglyphea.

[3][4][5][2][6] It is dominated by sponges, including the genus Phloedictyon and gorgonians.