Police have found what is believed to be a shallow grave in the Flinders Ranges as part of an investigation into the suspected death of a 21-year-old woman.

Major Crime detectives and local police are at the site at Moralana Creek, about 40 kilometres north of Hawker, and are in the process of examining the suspected grave.

A 20-year-old man from Kurralta Park, in Adelaide’s inner-south, has been arrested for failing to report a death to the Coroner.

He was taken into police custody and is expected to appear in the Port Augusta Magistrates Court tomorrow.

Police are continuing their investigations.