South Australian police say they have cracked on of the biggest drug rings in the state's history, making dozens more arrests.

They said the sophisticated operation involved importing illegal drugs from Vietnam and distributing them across Australia.

More than 270 officers raided 86 houses across metropolitan Adelaide over the past two days.

Police said they seized the equivalent of 30,000 street deals of heroin, cocaine and methamphetamine.

Assistant Crime Commissioner Paul Dickson said 37 people had been arrested and the total number of arrests from the year-long operation was now 55.

"We've been able to take a number of people out of their illicit dealing activities, both at the high level where they're organising, leading, importing, the mid-level where they're organising their street-level dealers and also the street-level dealers," he said.

 

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