Editing Houtman Abrolhos (section)

===Sea levels===
As with the rest of southwestern Australia, [[tide]]s at the Houtman Abrolhos are small and irregular. There is little tidal data available for the islands, but what there is accords very closely with the data for Geraldton. Geraldton tides follow a diurnal pattern, with maximum tidal ranges of around 1 metre (3&nbsp;ft).<ref name="Pearce 1997"/>

Mean sea levels at Geraldton show seasonal fluctuations, being higher in winter when the Leeuwin Current is at its peak. There are also variations from year to year, which are strongly associated with the [[El Niño-Southern Oscillation]] (ENSO) cycle. Apparently, ENSO events induce a weaker Leeuwin Current, which results in lower sea levels.<ref name="Pearce 1997"/>

There is no published information on wave heights in the Abrolhos. In the open ocean, waves are typically a little over two metres high all year round. Nearer the mainland, they are usually less than {{convert|1.2|m}}, with a calmer period in March and April, and another in October and November.<ref name="Pearce 1997"/>