NSW women injured after crashing into wall

Two women have been taken to hospital in a serious condition after a car they were in hit a rock wall in a national park in Sydney's north.

The women, believed to be aged 69 and 80, were driving along a winding road in the Ku-ring-gai Chase National Park around 2pm on Tuesday when the car struck a wall at the intersection of McCarrs Creek Road and General San Martin Drive.

Both were treated by paramedics at the scene, one with a punctured lung and chest injuries, before being taken to Royal North Shore Hospital in serious but stable conditions.

The road has been closed with traffic diversions put in place.