Police say an elderly man has been found, two days after he went missing north of Adelaide.

The 90-year-old, named by police only as Jeff, was last seen at 5pm on Wednesday on Kentish Road in Gawler Belt.

Jeff’s family and authorities had held concerns for his welfare, believing he may have become disoriented.

Police and State Emergency Service crews had searched near the Northern Expressway at Gawler Belt after he was sighted in the vicinity in the early hours of Thursday morning.

He was found this morning on the Northern Expressway at Ward Belt, according to police.

Police said he was understood to have been in a drain or ditch for a period of time.

The South Australian Ambulance Service said the man was “very unwell” when crews attended.

He has been taken to Lyell McEwin Hospital for treatment.