Two German tourists are seriously injured after their van collided with a logging truck near Dargaville today.

Police and other emergency services were called to the crash south of the Northland town at 10.30am.

Dargaville Sergeant Garth Mackay said the crash happened outside a farm-visit attraction, the Kumara Box.

"The van has been at the Kumaru Box, it's come out into the southbound lane and collided with a southbound truck heading towards Te Kopuru," he said.

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"The van, with two female German tourists, has ended up on the other side of the road in a ditch."

Mackay said the women were aged in their mid-20s.

The passenger in a serious condition and was taken to Whangarei Hospital by the Auckland Westpac Rescue Helicopter.

The driver was in a critical condition and was flown by the Northland Rescue Helicopter to Auckland.

She had to be cut from the driver's seat by volunteer firefighters.

The logging truck was empty and piggy-backing the trailer. The truck driver was not injured but very shaken.

All roads had reopened and Serious Crash Unit scene examinations have been completed.