separate the waters of Port Phillip from Bass Strait, except for a small gap known as The Rip, which also separates both peninsulas. The peninsula also separates the waters of Port Phillip and Western Port.

The Mornington Peninsula is crossed by many seismically active fault lines, monoclines, synclines and anticlines; the largest of which is the 100 km long Selwyn Fault which is capable of producing earthquakes of around 7.5