Missing four year old Cleo Smith has been found alive and well in Carnarvon Western Australia, and has since been reunited with her parents.

Her discovery comes over two weeks after she was first reported missing from her parents campsite.

WA Commissioner Chris Dawson commended the work of local police in their tireless efforts to find Cleo, after a police tip off led them to the house where she was found.

A 36 year old man has been arrested and is currently in custody, however the ongoing investigation makes it difficult for police to reveal any further details.