Time Out says
Found in the Goldfields area of Victoria, the Pink Cliffs are a geological reserve of, well, pink cliffs. The cliffs are a result of the sluice mining work done during the 1880s gold rush.
It almost looks like a crater on Mars, with deep crevasses of fine pink clay stretching across the field. The pinkish clay that makes up the cliffs has a texture similar to talcum powder and the colour of the cliffs can change depending on the time of day and weather conditions. You could be treated to cliffs ranging in colour from creamy yellow to salmon to a soft dusty pink.
The Pink Cliffs are ideal for travellers interested in geology (you can find a variety of rocks at the site, including smooth ironstone) as well as those after a great photograph. The site is easily accessible from Heathcote (it takes just 20 minutes to walk there from the centre of town), and it’s free to enter.