Sir Peter Jackson has finally confirmed his first post-Hobbit film - and it's an adaptation of another book.

Jackson, Fran Walsh, and Philippa Boyens will co-write Mortal Engines, based on a sci-fi novel series by Philip Reeve, Variety reported.

However, Jackson will not direct the film. That task has been given to first-timer Christian Rivers, a long-time collaborater of Jackson's.

"The combination of emotion and jaw-dropping visuals in Mortal Engines makes this the perfect movie for his move into feature directing," Jackson told Variety.

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"What Christian intends to do with Philip Reeve's terrific story is going to result in an original and spectacular movie. I wish I could see it tomorrow."

Four books have been written in Reeve's sci-fi series, and Rivers' film is intended to be the first in a series.

The story is set in the future, Variety reported, in a world where "cities roam the globe on huge wheels, devouring each other in a struggle for ever-diminishing resources".

It's the first film project confirmed by Jackson since The Hobbit: The Battle of the Five Armies was released in 2014.