Bombora is an indigenous Australian term for an area of large sea waves breaking over a shallow area such as a submerged rock shelf, reef, or sand bank that is located some distance from the shoreline and beach surf break. In slang it is also called a bommie.
As the wave passes over the shallow area its shape is raised and steepened, creating a localised wave formation. The size and shape of bombora waves makes them attractive to surfers willing to take the risk of riding what is generally considered a hazardous pursuit.
These formations can pose a significant danger even in good weather as a bombora may not be identifiable because it may not always have breaking waves.