Erebor, The Lonely Mountain where Smaug the Dragon lives in The Hobbit: The Desolation of Smaug, would cost around $6 billion to buy, if it was real, according to a new housing report. US real estate experts Movoto have put together some details of the "multilevel property" to coincide with the release of The Desolation of Smaug - based on JRR Tolkien's Hobbit book. The company has previously estimated the price of Hogwarts, Wayne Manor and Barbie's dream house in Malibu.

Martin Freeman The HobbitMartin Freeman as Bilbo Baggins in 'The Hobbit: The Desolation of Smaug'

On the basis that Erebor includes an entire underground city and working on the assumption that Middle Earth mirrors Europe, Movoto has valued Smaug's luxury property at $6 billion. It estimates that the Lonely Mountain is slightly north of Kirov in Russia and is probably around 44 square miles.

To come up with $6 billion, the company looked at the price of undeveloped properties for sale in the area and came up with an average figure of $52 per square metre.

The Hobbit: The Desolation of Smaug is the second part of Peter Jackson's three movie adaptation of JRR Tolkien's Hobbit novel. It continues the story of An Unexpected Journey in which Bilbo Baggins (Martin Freeman) travels with Gandalf (Ian McKellen) to the Kingdom of Erebor, throughout Mirkwood, Esgaroth and Dale, to combat the dragon Smaug (Benedict Cumberbatch).

Bilbo Baggins Desolation of SmaugBilbo Baggins Is On A Quest To Defeat Smaug

The movie - out this weekend - is generally considered by the critics to be better than the first.

"Everything is better this time around, but you still can't help but notice all the filler, the clumsy exposition, and graceless myth-making," said Vulture.

"The Desolation of Smaug satisfies both as a Saturday-matinee serial and as a tempting fanfare for the climactic There and Back Again, due next December," wrote Richard Corliss of Time Magazine.

"Onward to the third installment. Jackson is back on track," said the Associated Press.

"It's a rousing adventure, in parts; a film of great moments rather than a great film with a pattern of suspense that trails up and down like a hobbit over a mountain range," wrote the Radio Times.

Watch the trailer for The Hobbit: The Desolation of Smaug: