Located on the Old Renmark Road, about 6 kilometres west of Wentworth, the Perry Sandhills were formed after an ice age (40,000 years ago) and have been by wind erosion over thousands of years.

The dunes have significant heritage value, being of significant value to the First Australians and also for the skeleton remains of giant mega-fauna (including kangaroos, lions, emus and wombats) that have been found in recent years.

This area forms part of a flood plain that includes Thegoa Lagoon which is a non-permanent, freshwater wetland that supports a healthy and diverse array of native flora and fauna. It is an important cultural, social and economic resource to Wentworth and the Lower Murray Darling region. The lagoon is approximately 30 metres above sea level with a surface area of around 80 hectares and a capacity of more than 600 Megalitres. The floodplain Reserve bordered covers approximately 445 hectares.

Entry to the sand dunes is free and there is ample parking for veicles and longer off-road assemblages.