There are two regional settings in Twilight, and a number of domestic or institutional settings within each of those regions. The first region, and the major setting for the novel, is Forks, Washington and the surrounding area. Meyer evokes the perpetual rain of the Olympic Peninsula, using the mist, fog, and wet for several purposes. The first purpose for the reader is to drive home how different Forks is from Phoenix, which had been Bella's home. The second purpose is closely linked: it creates a sense of alienation and weirdness in itself, with the perpetual rain and the almost alien amounts of greenery. The third purpose relates to the novel's supernatural elements: the perpetually overcast skies make it easier for the vampires to hide their true nature. The proximity to truly raw nature enables them to hunt the wild animals they need to keep their thirst for human blood under control, and so maintain connection with their human selves. The fourth purpose is to incorporate the greater understanding of the Northwest Indian tribes beliefs in supernatural beings.

In the Forks area, there are several key settings. One is the high school. The physical layout of the school is sketched out in the first chapter. After that, the layout is taken largely for granted. What matters is the timeless feeling of a high school in a small town, and Meyer captures the gossip, the intrigue, and the shifting social framework well. The town itself is a related setting. Little attention is given to things like what buildings look like, but a lot of attention is given to the town's small scale and how well everyone knows one another. The wilderness gets a lot more specific attention. The actual wildness of the woods is important. It is essential that the vampires can hunt bear without drawing attention to themselves, that they can escape the eternal temptation of being around humans, and that they can have open spaces to play their vampire baseball,...

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