Anvil Hill is situated at Wybong, west of Muswellbrook in the Upper Hunter Valley of NSW, Australia. It is the largest intact stand of remnant vegetation on the Central Hunter Valley floor, home to threatened species and indigenous heritage. Centennial Coal wants to lay waste to this with an open-cut coal mine that will produce at least 9 million tonnes of coal a year and help drive the massive expansion of the Hunter Valley coal industry. If this goes ahead it will accelerate the onset of dangerous climate change, the greatest threat to human and non-human life.

The Anvil Hill Alliance is a group of organisations and individuals determined to stop the proposed mine.