Two female backpackers have survived a terrifying ordeal after a man allegedly tried to kidnap and murder them in South Australian bushland on Tuesday.

Suffering serious injuries, the international backpackers aged in their 20s were discovered by local fishermen near Salt Creek in Coorong National Park just before 6.30pm.

Police were called to Coorong National Park near Salt Creek. Credit:Ten News

"One of the victims was able to run away and came across some people fishing in the area," said police Superintendent James Blandford.

"They were able to comfort and secure her and make a call to the police.