George Jack Temperley-Wells disappeared in June after traveling with his mother from Darlington to Turkey’s Antalya region on June 29.
Teesside Live described George as a young boy with red hair, a pale complexion and dark eyes.
The four-year-old was last seen in the Antalya area and Durham Constabulary said they had “serious concerns for his well-being”.
Police have asked those in contact with her mother, Brogan Elizabeth Temperley, to urge her to contact authorities in Turkey or the UK as soon as possible.
A Durham Constabulary spokesperson said: ‘Police are appealing for urgent assistance to help locate a missing child.
“George Jack Temperley-Wells reportedly traveled from Darlington in the Antalya region of Turkey with his mother Brogan Elizabeth Temperley on June 29 this year.
“They probably spent time with the four-year-old’s father, 41-year-old Scott Nigel Wells, in Turkey.”
The spokesperson added: “George has red hair, a pale complexion and dark eyes. Her mother, Brogan, is 28 and described as a slim figure with long dark hair and dark eyes.
“George was last seen in the marina area of Antalya in Turkey, where two of these photos were taken.
“Police have serious concerns for his well-being and urgently need to locate George and speak with his mother.
“Anyone in contact with her is urged to encourage her to contact the Turkish or UK authorities immediately to confirm her whereabouts and/or seek assistance to return home.”
Those in the UK have been instructed to call Durham Police on 101 with incident number 325 of June 30.
Those in Turkey should either go to a local police station or call the emergency number 112/115.