MedStar paramedics, Major Crash investigators called to fatal crash in the Barossa

A 70-year-old woman has died after her car hit a tree in the Barossa.

A woman has died and another has been seriously injured in a crash at Bethany, in the Barossa.

The single vehicle collision occurred about 2.30pm on Saturday.

A 70-year-old woman from Swan Reach died after a car slammed into tree in the Barossa Valley on Saturday. Picture: 7NEWS

The driver, a 70-year-old woman from Swan Reach, died after her car hit a tree.

She is the ninth person to die on South Australian roads this year.

Her female passenger, 37, was taken to hospital by ambulance with serious, but not life-threatening, injuries.

MedStar paramedics were called to the incident.

Bethany Rd is closed to traffic while Major Crash investigators examine the scene.

SA Police are asking motorists to avoid the area.