An abandoned van belonging to a German backpacker missing in the Western Australian Outback for two weeks has been found - but she was not with the vehicle.

Carolina Wilga, 26, who has spent two years backpacking around Australia working at mine sites and farms, was seen with the van on CCTV at a service station in Toodyay, northeast of Perth, on June 28.

She made contact with friends the next day while travelling near Beacon, in WA's remote Wheatbelt region, and visited a convenience store but then vanished.

She has not been seen or heard from in 11 days.

At 1.10pm on Thursday, WA Police discovered a Mitsubishi Delica van abandoned in the Karroun Hill area, about 100km north of where Ms Wilga was last seen in Beacon.