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Blackbutt lookout picnic area in Border Ranges National Park is a popular picnic area next to a scenic lookout offering views of Tweed Valley. While visiting Border Ranges National Park be sure to stop by Blackbutt lookout picnic area to enjoy a dramatic vista across a spectacular geological formation. This popular picnic spot sits on the Tweed Caldera escarpment edge, with a lookout platform offering incredible views out over Wollumbin-Mount Warning and the whole Tweed Valley from the edge of the Tweed Caldera escarpment. Tweed Caldera is one of the biggest erosion calderas in the southern hemisphere and one of the largest in the world. It’s also one of the few places on earth where the erosion process can be seen all the way down to the underlying pre-volcanic sedimentary and metamorphic rocks, providing geology enthusiasts with a wonderful opportunity to test their knowledge of geological processes.