Somerset: Kellynch Hall, where Anne Elliot and her family lives, is located in Somerset. Even though the actual estate is fictional, the town it is located in, is not.
Box Hill: This is the location in the novel where Emma has an argument with Miss Bates. This is a real location in North Downs that is now owned by the National Trust.
London: London of course plays a huge role in many of the novels, as it should since it is so prominent. In Pride and Prejudice, Elizabeth’s (or Eliza, which also happens to be the name of Jane Austen’s cousin) aunt and uncle lived there.