Geltwood Beach is a coastal beach access point within Canunda National Park, located approximately 12.3 kilometers southwest of Millicent, South Australia. The beach forms part of a 40-kilometer coastline characterized by rugged limestone cliffs and, in its southern section, mobile sand dunes backed by low foredunes. Access for conventional vehicles is possible via the Canunda Causeway from Millicent, leading to a designated area known as Oil Rig Square/Geltwood Beach. The beach itself is used as a route for four-wheel driving along the length of the national park, following marker posts through the dunes and along the sand. Paddlers should be aware that the beach access track may be subject to washouts and can be impassable, requiring extreme care. The coastline is exposed to the open ocean, and conditions can feature huge rollers crashing onto the beach, particularly during strong southerly winds, indicating significant surf and shore-break potential. The area has historical significance, with evidence of the Aboriginal Boandik people who once lived in temporary camps along the coast visible throughout the park. Facilities at the Geltwood Beach Campground include long drop toilets and firepits, though fire restrictions apply and the collection of firewood is prohibited. The campground operates on a fee system. The surrounding Canunda National Park offers a rugged coastal aesthetic with notable geographical features including nearby Eddy Bay, Cullen Bay, and Lonely Reef.