A witness leapt to help after a crash left a motorcycle rider seriously injured in the Western Riverina.
About 8.30pm on Wednesday, police have been told a man left a gathering with friends on a private property on Lower Thule Road, Thule - about 70 kilometres north-west of Moama - on a dirt bike.
Shortly after, the man rode the motorcycle through a paddock, before losing control after failing to negotiate an embankment, according to NSW Police.
After the impact threw the rider off the dirt bike and knocked him unconscious, a witness rendered first aid and contacted emergency services.
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NSW Ambulance paramedics attended and treated the rider - a 21-year-old man - for serious head injuries.
He was airlifted to the Alfred Hospital Melbourne in a critical condition, where he remains in a serious but stable condition.
An investigation into the circumstances surrounding the crash is underway.
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