Mountain bike rider injured in 20 meter fall.

A 35-year-old male has sustained serious injuries in a 20 meter fall while riding his mountain bike in the Stromlo Forrest.

The ACT Ambulance Service utalised a specialised 4-wheel-drive Ambulance to retrieve and treat the patient, who sustained injuries to his face, back and head.

The ACT Ambulance Service will shortly depart the scene and transport the patient to the Canberra Hospital. The patient is being transported in a stable condition.