A 24-year-old woman was caught with three kilogrammes of cocaine mixed with rice, police said on Sunday.
The woman was found with the rice parcel wrapped in newspaper at the Beit Bridge border gate, Musina in the Limpopo province on Friday night.
The cocaine was worth R1.6m.
Major Robert Netshiunda said this followed a joint operation by the Hawks and the SA Revenue Services in Limpopo.
Netshiunda said officers had stopped a bus which had entered the country from Malawi.
He said that a narcotics dog led the officers to a bag that belonged to the woman.
"When the Hawks searched the bag, they found a white powder mixed with rice which was wrapped in newspaper," he said.
Netshiunda said cocaine was found in the powder.
The woman has been charged with dealing in drugs and will appear in Musina Magistrate's court on Monday.