The Organ Pipes, a set of basalt columns formed by the cooling and cracking of molten lava, are the most well known feature of the park. Enjoy a picnic, a walk and the spring wattle blossom. Things to do - The park is an excellent place for picnics, walks, bird observing and photography. - Stand on the viewing platform - the basalt Keilor Plains all around you are part of one of the world's largest lava flows. - Walk down the path to view the 'organ pipes' - a set of basalt columns formed by lava. - Look for yellowish sandstones and mudstones across the creek 200 metres downstream from the 'organ pipes'. - Fossils in these rocks suggest they are sedimentary rocks laid down under the sea about 400 million years ago. - Walk upstream about 400 metres past the 'organ pipes' and see Rosette Rock - a radial array of basalt columns like the spokes of a wheel. - Look at the Tessellated Pavement, the tops of basalt columns. - Enjoy a picnic while looking out for waterbirds, blue wrens, cockatoos, rosellas, magpies and wedge-tailed eagles. Before you go Conditions can change in parks for many reasons. For the latest information on changes to local conditions, please visit the relevant park page on the Parks Victoria website. Be bushfire ready in the great outdoors. Refer to the Bushfire Safety section on the Parks Victoria website for tips on how to stay safe.