A woman has escaped unscathed after her partner fought off an armed would-be carjacker in Victoria's regional north.
The armed offender pulled up behind the woman's Holden Sedan in Wallan at 8 pm on Saturday then got out of his car and threatened her with his gun, demanding her car.
The victim's partner approached the armed gunman and managed to fight him off, causing the gunman to flee the scene.
The man is described as Caucasian, 170 cm tall with a solid build and brown eyes, wearing a black hoodie with a red shirt underneath and black track suit pants.
Crime Stoppers 1800 333 000.
© AAP 2019