Coalstoun Lakes is a national park located 25 km southwest of Biggenden, Queensland. It features a volcano, Mount Le Brun, which has two craters that contain intermittent crater lakes. Coalstoun Lakes is Queensland’s smallest national park.
The park is an area of remarkable geological interest. It is the site of a volcano that erupted more than 600,000 years ago, yet it is still one of the youngest volcanic formations in Australia. Evidence of the basalt lava that flowed out from the craters is still present, in the form of the large basalt rocks along the walking track. This is known as Baranbah Basalt. The lakes were named by Wade Brun, manager of nearby Ban Ban Station, in 1894 after an ancestral home in Scotland.