Body of missing German tourist found near Alice Springs after police use phone data

The body of missing German tourist Monika Billen, who was last seen on New Year's Day, is believed to have been found outside of Alice Springs.

German tourist Monika Billen vanished near Alice Springs. Source: AAP

The body of missing German tourist Monika Billen is believed to have been found in the East MacDonnell Ranges outside Alice Springs.

Ms Billen was last seen around Emily Gap in the ranges on the afternoon of New Year's Day but a witness told investigators she'd given her a ride the day before.

On Thursday Northern Territory Police located a body believed to be that of the 62-year-old during aerial searches.

In a statement, Superintendent Pauline Vicary said police found the body at 3.15pm under a tree and off a track 2.9km west of Emily Gap.

Monika Billen, 62, was reported missing in the Alice Springs area after she failed to return to her motel. Source: Supplied

Authorities were contacted on January 8 after Ms Billen failed to check out of her hotel and board a flight to Darwin.

"Police received additional information from Ms Billen's telecommunications provider and continued with aerial searches in specific areas for the past two days," Mr Vicary said.

Police have contacted the family.

"It is deeply upsetting that we have to tell her family this sad news but we are relieved to be able to provide them with answers," Mr Vicary said.

A report will be prepared for the coroner.