Mount Beerwah is the highest of the ten volcanic plugs in the Glass House Mountains range, 22 kilometres (14 mi) north of Caboolture in South East Queensland, Australia. It was formed 26 million years ago during the Oligocene Epoch of the Paleogene Period. Geologists estimate it may be only a third of its original height due to intense erosion.

A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present, a plug can cause an extreme build-up of high gas pressure if rising volatile-charged magma is trapped beneath it, and this can sometimes lead to an explosive eruption. In a plinian eruption the plug is destroyed and ash is ejected.