Readers and avid fans of the Harry Potter book series have long speculated about the origins of the wizarding world created by Author JK Rowling.

While dropping previous hints as to the idea's genesis "on a Manchester-London train" and suggesting a number of locations that might have inspired her, the much-loved author finally disclosed what she considered the "true" birthplace of the Harry Potter on Twitter today (Friday, May 22).

Turns out it was a flat in Clapham Junction.

After a fan posted a photo of an Edinburgh cafe rumoured to be favoured by Rowling online, she responded with a Thread detailing a number of locations that featured on her odyssey of writing in various spots while composing the series that would later go onto become of the most successful book franchises of all time.

Among the posts, Rowling tweeted: "This is the true birthplace of Harry Potter, if you define 'birthplace' as the spot where I put pen to paper for the first time.*

"I was renting a room in a flat over what was then a sports shop.

"The first bricks of Hogwarts were laid in a flat in Clapham Junction."

Elsewhere in the thread posted earlier today the millionaire author described the genesis of the idea on a train and revisited several other locations she had written the series in, including an Edinburgh hotel and a cafe in Porto, Portugal.