neck of the woods

See neck (“narrow tract of land”) or from Algonquian naiack ("point" or "corner").^[1][2]

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neck of the woods (plural necks of the woods)

1. (idiomatic) A local neighbourhood or region.
2. (idiomatic) A place or field in which one is comfortable or with which one is familiar.

• up someone's alley, right up someone's alley