Port Phillip Heads Marine National Park protects a diverse marine environment comprising Swan Bay, Mud Islands, Popes Eye, Point Lonsdale, Point Nepean and Portsea Hole. The Point Lonsdale section of the park is located between Queenscliff and the western side of the Port Phillip entrance.

The intertidal reef is a great place for beginner and advanced snorkellers, as well as divers, to explore and experience a diverse array of Victoria’s marine life. Snorkelling around Point Lonsdale jetty and nearby reef is very popular in summer.

The popular dive site, Lonsdale Wall, is composed of a series of ledges which mark the edge of the historical course of the Yarra River.

Lonsdale Reef near Point Lonsdale has four visible and recognisable shipwrecks - the iron sailing barques George Roper, Holy head and Gang, and the gold rush steamer Conside.

The outer limits of the park at Point Lonsdale can be subject to strong currents when water is moving in and out of The Heads.