Three teenagers have been jailed for the rape of a Canadian backpacker in Broome last year, in what the judge described as a cowardly act of savagery.

The court heard the 22-year-old victim was 'on the holiday of a lifetime' in Broome when she became lost walking home from a bar.

She had left Murphy's Bar in the early hours of the morning with her friends when she became separated from them and ended up alone and lost on Anne Street in old Broome, a notorious trouble spot.

The court heard she called her boyfriend, worried she would get into trouble if she remained alone.

Five people approached her, including two 18-year-old men, a 13-year-old boy, a 17-year-old man and an 18-year-old woman.

The group's female, Agnes Oliver, threatened the victim with a broken bottle and she was punched in the face several times while two of the men stole her handbag.

The tourist followed the group, pleading for her bag back as it contained her passport and credit cards.

By now the group had moved into a nearby park where they removed a phone and $30 from the wallet.

Oliver continued to threaten the victim.

Abused

Two of the men, Earvin Jared Dimer and Darren Peter Upkett, and another of the boys, began touching the woman and one of them removed her bikini top.

Two of the men then raped the victim.

The court was told they also attempted to photograph the victim's battered body, using the phone they had stolen from her.

The woman managed to get to the police station and was later conveyed to hospital.

Oliver, Dimer and Upkett appeared in the Broome District Court charged with one count each of aggravated robbery and three counts each of aggravated sexual penetration without consent.

Oliver's lawyer argued she was intoxicated by alcohol and cannabis at the time and "really didn't know what she said" to the victim that night.

Judge Christopher Stevenson said although Oliver did not physically take part in the sexual assault, she "did nothing to assist, she in fact encouraged and assisted Upkett by threatening to punch the victim."

He condemned Oliver's role in the attack, saying "she took the lead, armed with a broken bottle to commit the robbery."

The court heard that within a year of turning 18, Dimer had already committed four serious offences.

The lawyer for Upkett said his client had been addicted to alcohol and cannabis by age 12 and he was the only one who showed remorse at the time of the attack, telling the victim that he was sorry, saying "I'll give your stuff back, I'll come back."

Callous savagery

In sentencing on Monday, the judge described the events as "cowardly and callous acts of savagery."

Judge Stevenson also said "not one of you had the human decency to protest" at what was happening, and noted that the group mentality fuelled the attack, as did alcohol and cannabis.

"I accept it was opportunistic and I also accept the violence and sexual penetration were opportunistic but it's clear you were out to steal whatever you could find, and it's not surprising something happened," he said.

Oliver and Dimer were sentenced to five and a half years' jail each.

Upkett was sentenced to six and a half years' jail.

A 14-year-old boy has already been given a ten month conditional release for his part in the incident.

An 18-year-old, who has pleaded not guilty to his charges, faces trial next month.