| Mount Ningadhun | |
|---|---|
| Castle Rock, Ningadoon (Hunt), Ningadhun [1] | |
 | |
| Highest point | |
| Elevation | 1,373 m (4,505 ft) [2] |
| Coordinates | 30°17′17″S150°04′12″E / 30.28806°S 150.07000°E Coordinates: 30°17′17″S150°04′12″E / 30.28806°S 150.07000°E [1] |
| Geography | |
  Mount Ningadhun | |
| Parent range | Nandewar Range |
Mount Ningadhun, also Castle Rock, Ningadoon (Hunt), and Ningadhun, [1] a mountain on the Nandewar Range, a spur off the Great Dividing Range, is located in the North West Slopes region of New South Wales, Australia. Mount Ningadhun is situated east of Narrabri within the Mount Kaputar National Park.
A mountain is a large landform that rises above the surrounding land in a limited area, usually in the form of a peak. A mountain is generally steeper than a hill. Mountains are formed through tectonic forces or volcanism. These forces can locally raise the surface of the earth. Mountains erode slowly through the action of rivers, weather conditions, and glaciers. A few mountains are isolated summits, but most occur in huge mountain ranges.
The Nandewar Range, a mountain range that is part of the Great Dividing Range, is located in the Northern Tablelands region of New South Wales, Australia. The range is situated approximately 30 km (19 mi) east of the township of Narrabri.
The Great Dividing Range, or the Eastern Highlands, is Australia's most substantial mountain range and the third longest land-based range in the world. It stretches more than 3,500 kilometres (2,175 mi) from Dauan Island off the northeastern tip of Queensland, running the entire length of the eastern coastline through New South Wales, then into Victoria and turning west, before finally fading into the central plain at the Grampians in western Victoria. The width of the range varies from about 160 km (100 mi) to over 300 km (190 mi). The Greater Blue Mountains Area, Gondwana Rainforests, and Wet Tropics of Queensland World Heritage Areas are located in the range.
With an elevation of 1,373 metres (4,505 ft) above sea level, Mount Ningadhun is a prominent volcanic plug and part of the remnants of the Nandewar extinct volcano that ceased activity about 17 million years ago after 4 million years of activity. [3]
The Australian Height Datum is a vertical datum in Australia. According to Geoscience Australia, "In 1971 the mean sea level for 1966-1968 was assigned the value of 0.000m on the Australian Height Datum at thirty tide gauges around the coast of the Australian continent. The resulting datum surface, with minor modifications in two metropolitan areas, has been termed the Australian Height Datum (AHD) and was adopted by the National Mapping Council as the datum to which all vertical control for mapping is to be referred."
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 pressure if rising volatile-charged magma is trapped beneath it, and this can sometimes lead to an explosive eruption. Glacial erosion can lead to exposure of the plug on one side, while a long slope of material remains on the opposite side. Such landforms are called crag and tail. If a plug is preserved, erosion may remove the surrounding rock while the erosion-resistant plug remains, producing a distinctive upstanding landform.
