Coalstoun Lakes

Coalstoun Lakes National Park is located in the South Burnett region of southeast Queensland, near Biggenden, protecting a distinctive landscape of volcanic crater lakes and surrounding dry rainforest. The park contains two interconnected maar volcanic craters that now hold permanent lakes, providing a rare natural feature in this predominantly agricultural region. The lakes are important for waterbirds and aquatic species, while the surrounding dry rainforest on the volcanic soil is an example of a vegetation community that is now very rare in southeast Queensland. The park protects significant geological and biological heritage in a region that has been extensively modified by land clearing.

Coalstoun Lakes National Park supports diverse wildlife centred on the permanent water of the volcanic lakes. Waterbirds including ducks, herons, cormorants, and grebes are year-round residents, with additional species visiting during seasonal movements. Freshwater turtles inhabit the lake waters. The surrounding dry rainforest supports brush turkeys, parrots, and diverse woodland birds including species that have declined across the cleared agricultural landscape. The lakes attract wildlife from surrounding farmland, making them an important refuge and waterhole in the regional landscape.

The vegetation of Coalstoun Lakes National Park includes dry rainforest or vine scrub growing on the fertile basaltic soils surrounding the crater lakes. This vegetation type, once widespread on the rich volcanic soils of southeast Queensland, has been almost entirely cleared for agriculture and now survives only in small patches. The dry rainforest includes deciduous and semi-deciduous trees, native figs, and diverse understory species. Aquatic vegetation including waterlilies and reeds grows in and around the lake margins. The combination of dry rainforest and permanent water creates high habitat diversity in a small area.

Coalstoun Lakes are maar craters formed by volcanic explosions that occurred when rising magma encountered groundwater or surface water, causing violent steam explosions. The explosions excavated craters in the surrounding rock, which later filled with water to create the crater lakes. The volcanic activity at Coalstoun Lakes is estimated to be relatively recent in geological terms, occurring within the last few million years. The surrounding basaltic volcanic material has weathered to produce the fertile red soils that support the dry rainforest vegetation. The maar craters are among the best-preserved examples of this volcanic landform in southeast Queensland.

Coalstoun Lakes National Park experiences a subtropical climate with warm summers and mild winters, with summer-dominant rainfall associated with thunderstorms and occasional east coast low-pressure systems. The South Burnett region is drier than the coastal areas, with moderate annual rainfall that sustains the lakes and supports the dry rainforest vegetation. Extended dry periods can reduce water levels in the lakes. Summer temperatures can exceed 35°C, while winter nights are cool and occasionally frosty. The mild winter conditions are the most comfortable time for visiting.

The South Burnett region was home to the Wakka Wakka Aboriginal people, who maintained cultural connections to the fertile volcanic country and its water resources. The crater lakes would have been significant features in their cultural landscape, providing permanent water in a region where seasonal water availability was variable. European settlers recognised the agricultural potential of the volcanic soils and cleared the region extensively for dairying, farming, and grazing from the mid-nineteenth century. The national park preserves one of the few remaining examples of the dry rainforest that once covered the volcanic soils of the region.

Coalstoun Lakes National Park was established to protect the rare dry rainforest vegetation on the volcanic soils and the distinctive volcanic crater lake landscape, recognising the conservation importance of these features in a region where such vegetation has been extensively cleared. The park's small size means that every hectare of protected vegetation is significant. Management focuses on controlling invasive weeds that threaten the dry rainforest and maintaining the ecological integrity of the lake system.

The volcanic crater lakes are the primary attraction of the park, providing an unusual and scenic natural feature in the South Burnett agricultural landscape. Walking tracks around the lakes provide access to the diverse vegetation and waterbird watching opportunities. The distinctive dry rainforest vegetation, with its diverse deciduous trees, provides an interesting botanical experience different from the more commonly known subtropical rainforests of the coastal ranges. The park is a short detour from the Burnett Highway and suitable for a brief stop during travel through the South Burnett region.

Coalstoun Lakes National Park has picnic facilities and walking tracks accessible from the township of Coalstoun Lakes near Biggenden. The park is accessed via the Burnett Highway and then local roads. Gayndah and Monto are the nearest towns with services. The park is suitable for day visits by families and nature enthusiasts. The relatively small size of the park means that the main features can be explored in a few hours. The cooler months from May to September are the most comfortable time to visit.

Conservation management at Coalstoun Lakes National Park focuses on controlling invasive weeds that threaten the rare dry rainforest, particularly lantana and other exotic shrubs that can invade the forest margins. Maintaining water quality in the volcanic lakes is important for supporting the aquatic wildlife community. The park's small size and location within an agricultural landscape means that edge effects and weed invasion are ongoing management challenges. Connectivity with adjacent vegetation patches is important for maintaining viable wildlife populations. Community engagement with local landholders is important for managing threatening processes in the broader landscape.