At over a mile in length, the Busselton Jetty is the longest of its kind found anywhere in the Southern Hemisphere. Because Busselton’s Geographe Bay is far too shallow for ships, the Jetty was constructed as a means of transporting cargo to deeper water. Though ships no longer dock here today, Busselton Jetty is now a draw for legions of coastal visitors, who stroll the jetty, take in the views, and swim in the waters of Geographe Bay whenever it’s warm enough in summer. Aside from the scenic stroll over water, a popular activity at Busselton Jetty is visiting the Underwater Observatory, where a spiral staircase leads 26 feet to the ocean floor below. With 11 portholes for viewing beneath water, the Observatory offers a look at marine life inhabiting the artificial reef, which includes a colorful collection of coral that’s rare for the southern latitude.