Located within the national park is Budj Bim, formerly named Mount Eccles by the European people who settled in the area, is the site of one of the most recent active volcanos in Australia. The first activity was about 40,000 years ago when Budj Bim was formed by lava pouring out the Earth's crust. The most recent eruption was approximately 8,000 years ago. Budj Bim is a fairly small hill surrounded by lush vegetation with a small, hidden, deep volcanic crater lake named Lake Surprise. It is famous for an adjacent lava tube and there are numerous lava tubes in the surrounding farm land.