Mount Warning (Bundjalung: Wollumbin), a mountain in the Tweed Range in the Northern Rivers region of New South Wales, Australia, was formed from a volcanic plug of the now-gone Tweed Volcano. The mountain is located west-south-west of Murwillumbah, near the border between New South Wales and Queensland. Lieutenant James Cook saw the mountain from the sea and named it Mount Warning. Shield volcano Mount Warning is the central volcanic remnant of an ancient shield volcano, the Tweed Volcano, which would have been about above sea level or just under twice the height of the current mountain. This volcano last erupted around 23 million years ago. As the mountain's central vent cooled it shrank, forming a depression at the top that has greatly eroded. Today the vast areas that were part of the volcano include many mountains and ranges at some distance from Mount Warning, and include the Border Ranges, Tamborine Mountain, the McPherson Range and both the Lamington Plateau and Springbrook Plateaus. The erosion caldera formed since this eruption is easily visible around the summit and forms the rim of the Tweed Valley. During the last stages of eruption, different and more resistant forms of lava that were cooler than those flows that created the shield volcano remained to form the current peak. The whole central Mount Warning massif was also pushed up by forces that remained active after lava eruptions had stopped. Aboriginal significance Wollumbin is a place of cultural and traditional significance to the Bundjalung people and contains sacred sites, where particular ceremonies and initiation rites are performed. The summit area of the Mountain is a declared Aboriginal Place under the National Parks and Wildlife Act. While now spelt Wollumbin, the Aboriginal word had numerous alternative spellings which are recorded in the historic record including; Walumban, Walumbin, and Wooloombin, all referring to the same place. In 1873 reference can be found to the Mountain being referred to by Aboriginal people as "Wollumbin", signifying "big fellow mountain". The Aboriginal significance of the area is contextual and dependant on direction of observance, gender, and status of whoever is telling the story. Several different stories exist about Wollumbin including reference to the Mountain as the Warrior Chief, a special place of significance for brush turkey, and the cloud catcher. Many more stories exist that are not in the public record. The name Wollumbin refers to the whole of the central vent