Point Nepean marks the southern point of The Rip and the most westerly point of the Mornington Peninsula, in Victoria, Australia. It was named in 1802 after the British politician and colonial administrator Sir Evan Nepean by John Murray in HMS Lady Nelson. Its coast and adjacent waters are included in the Port Phillip Heads Marine National Park, while its land area is part of the Point Nepean National Park. The point includes Cheviot Beach on its southern side, notable as the site of the disappearance in 1967 of Australia's then-Prime Minister Harold Holt.

Port Phillip or Port Phillip Bay is a horsehead-shaped enclosed bay on the central coast of southern Victoria, Australia. The bay opens into the Bass Strait via a short, narrow channel known as The Rip, and is completely surrounded by localities of Victoria's two largest cities — metropolitan Greater Melbourne in the bay's main eastern portion north of the Mornington Peninsula, and the city of Greater Geelong in the much smaller western portion north of the Bellarine Peninsula. Geographically, the bay covers 1,930 km2 (750 sq mi) and the shore stretches roughly 264 km (164 mi), with the volume of water around 25 km3 (6.0 cu mi). Most of the bay is navigable, although it is extremely shallow for its size — the deepest portion is only 24 m (79 ft) and half the bay is shallower than 8 m (26 ft). Its waters and coast are home to seals, whales, dolphins, corals and many kinds of seabirds and migratory waders.