Gus Lamont's parents plead for information as $1m reward for missing boy announced

The parents of Gus Lamont have spoken publicly about his disappearance for the first time, with South Australia's Premier announcing a A$1 million reward for anyone who can provide critical information.

It has been almost a year since the four-year-old was reported missing from his home at Oak Park Station, a vast property near Yunta in South Australia's outback.

SA Police have said the investigation has been one of the largest and most intensive missing persons operations they have undertaken, with 11 ground searches conducted over 30 days as well as aerial efforts.

Premier Peter Malinauskas made the announcement of a reward at a media conference on Wednesday afternoon, where a video statement was played from Gus's parents.

It was the first time the public has heard directly from Gus's parents Josh and Jess Lamont.

Sitting side by side, they desperately urged anyone with information to come forward.