The Wombat State Forest is the headwaters of the Lerderderg, Campaspe and Loddon rivers. An interesting part of the forest is a large number of mineral springs. These are about 80% of Australia’s mineral springs. The mineral waters are rich in calcium, silica, magnesium, iron and sulphur. The volcanic activity of the region has added carbon dioxide to the water that is seen in the form of bubbles emerging from the springs.