The moor in Arthur Conan Doyle’s Gothic detective novel The Hound of the Baskervilles is Dartmoor.
Dartmoor is a vast, rugged upland in Devon, south-west England, and the novel’s bleak landscape gives the mystery much of its Gothic atmosphere. Sherlock Holmes and Dr. Watson investigate the Baskerville family curse around Baskerville Hall, which is situated on or near the moor.
The story’s supernatural legend claims that a demonic hound has haunted the Baskerville family since the time of Sir Hugo Baskerville. Doyle drew inspiration from Dartmoor folklore, especially stories surrounding the supposedly wicked squire Richard Cabell and his tomb at Buckfastleigh. He also explored Dartmoor with journalist Bertram Fletcher Robinson while developing the novel.
A common mix-up is to confuse Dartmoor with Exmoor or the Yorkshire Moors. Those are real moorland regions in England, but Dartmoor is the specific setting named in the novel. The book was serialised in 1901 and published as a novel in 1902.