A mother who drowned three of her children and attempted to kill a fourth by driving the family car into an Australian lake was sentenced Tuesday to 20 years and six months in prison.

Akon Guode, 37, drove a SUV carrying four of her seven children into the lake in Melbourne in April 2015. Her 5-year-old daughter Alual survived after passersby pulled her from the partially submerged car.

But Guodes' 16-month-old son Bol and 4-year-old twins, Hanger and her brother Madit, died. Victoria state Supreme Court Justice Lex Lasry said he would have sentenced Goude to life in prison if she had not pleaded guilty to murder and attempted murder.

"People don't understand why you did what you did," the judge said. "In my opinion, your actions were the product of extreme desperation," he added.

Goude wept and wailed through her sentencing hearing as the judge outlined her crimes and her troubled life that led to it.

Born one of 16 children in 1979, she fled Sudan's civil war in which her husband died and arrived in Australia as a refugee in 2006.

The judge set a non-parole period of 20 years and said she will likely be deported on release. Her hometown, the city of Wau, is now in South Sudan, which became an independent country in 2011. It's not clear to which country she will be deported.