Karlu Karlu / Devils Marbles Conservation Reserve

The reserve spans 1,802 hectares of arid Central Australian scrubland on the Barkly Tablelands, straddling the Stuart Highway. The boulders were formed from a single granite intrusion some 1,700 million years ago; weathering and exfoliation over eons have rounded and split them into the improbable stacks and single spheres visitors see today. Self-guided walking trails loop around and between the formations, with interpretive signage explaining both the geology and the Warumungu cultural significance of the site.

The reserve is jointly managed by the Parks and Wildlife Commission NT and the Warumungu traditional owners. Visitors are asked not to climb the boulders out of respect for their cultural significance and for safety. A bush campground operates on-site with fireplace facilities; during peak season from May to September a campground host is present. Campsites must be booked and paid for online in advance, as walk-in payment is not accepted at the gate.

Entry requires a current NT Parks Visitor Pass, purchased online before arrival, with NT residents exempt. The reserve is open year-round and accessible 24 hours, though the cooler months from April to September are strongly recommended. The site is approximately 105 kilometres south of Tennant Creek and 403 kilometres north of Alice Springs, making it a natural stop on any Stuart Highway journey.