Twyfelfontein is a site of ancient rock art located in the Kunene region of Namibia, about 70 km west of the town of Khorixas. The name Twyfelfontein means "doubtful spring" in Afrikaans, and refers to a nearby spring that may or may not flow year-round.

The site is a UNESCO World Heritage Site and contains one of the largest concentrations of rock art in Africa, with over 5,000 individual images and engravings on sandstone outcrops. The rock art is estimated to be between 2,000 and 6,000 years old, and includes depictions of animals such as giraffes, elephants, rhinoceroses, and lions, as well as human figures and abstract designs.

In addition to the rock art, Twyfelfontein also contains a number of ancient stone structures, including a series of circular stone arrangements that are thought to have been used for ceremonies or rituals. These structures are believed to have been built by the indigenous Damara people, who are still present in the area today.

Visitors to Twyfelfontein can take guided tours of the site, which typically last about an hour and cover the major rock art sites as well as the stone structures. There is also a small museum on site that provides additional information about the history and culture of the area.