An Australian couple who plunged 10 metres from a fortress wall while holidaying in Dubrovnik are fighting for their lives after suffering serious injuries, according to local media reports.

A 34-year-old man and a 26-year-old woman reportedly fell from a medieval clifftop fortress near the Croatian coastal city in the early hours of Saturday.

They were taken to Dubrovnik General Hospital where the woman remains in a critical condition in intensive care.

Her companion is in a serious condition after undergoing emergency surgery.

Trauma specialist at Dubrovnik General Hospital Dr Ivan Bencic told Croatian media outlet HRT the woman had suffered a spinal cord injury, cerebral damage and fractures in her vertebrae.

A spokeswoman for Dubrovnik-Neretva police told local news station Dubrovacka Televizija the couple had been intoxicated and cuddling or kissing when they fell.

The fall is being treated as an accident.

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The Department of Foreign Affairs and Trade said Australia was providing consular assistance to two injured people in Croatia.

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