Desperate search for two children who have been missing for four days

A desperate search is underway for two young children who disappeared four days ago. 

Queensland Police said the 11-year-old girl and a 10-year-old boy, who are known to each other, have been missing from Mareeba, just west of Cairns, since Thursday.

Police are searching for the two children who are believed to still be in the Cairns or Tablelands area.

Police hold concerns for their welfare due to their young age.

They are Caucasian in appearance and are of slim build.

The girl is around 150cm tall with brown hair and green eyes and the boy is 145cm tall with blonde hair and blue eyes.

Investigators are asking anyone with information on their whereabouts to contact police or Crime Stoppers on 1800 333 000.