The Organ Pipes National Park is a small park of 152ha 23 kilometres north-west of Melbourne covering a deep gorge of Jackson Creek on the Keilor planes. The Organ Pipes are basalt columns formed by lava 1 million years ago, other rock features include Roesette Rock, a radial array of basalt columns and sedimentary rocks with fossils laid down under the sea about 400 million years ago.
Victoria is Australia's second smallest State and covers only 3% of Australia's land area but has the second highest population of all States and Territories. Victoria's mainland and islands have a total length of 2,512 kilometres coastline which is about 4.2% of Australia's 59,736 kilometres of coastline. Australia is the driest inhabited continent and Victoria is no exception although the state capital Melbourne has the reputation to have 4 seasons in one day. Victoria is located in the southeast of mainland Australia and includes the most southern point on mainland Australia at Wilsons Promontory National Park.