POLICE are concerned for the welfare of a 13-year-old girl who is believed to be travelling through South Australia with a 36-year-old man.

Larni Edwards was last seen when she left her home at Ultima, near Swan Hill, on April 17.

SA police said there had been a confirmed sighting of the girl in Ballarat in the company of Dean Patrick James.

They believe the pair is travelling in a blue 1997 Ford station wagon possibly bearing false registration plates QZW540.

Anyone seeing the car or the girl is asked to contact police.