Busselton Jetty and Underwater Observatory

Busselton Jetty and Underwater Observatory is a heritage-listed timber jetty extending 1.841 kilometres into Geographe Bay at Busselton, Western Australia, about 220 kilometres south of Perth. Constructed between 1865 and 1960, it is the longest timber-piled jetty in the Southern Hemisphere. The attraction includes a jetty train, Interpretive Centre and an Underwater Observatory at the jetty's end, allowing observation of marine life at eight metres depth.

Visitors can walk or ride the solar-powered jetty train along the 1.841 km timber jetty over Geographe Bay to the Underwater Observatory. At the end, a guided tour descends via stairs to an 8-metre-deep observation chamber with large windows viewing coral, sponges and over 300 marine species on the jetty piles. The foreshore area includes an Interpretive Centre, museum displays, cafe and gift shop, with open ocean views and fishing areas along the jetty.