the sticks
Synonym discussion
Sense: idiom/1
All four phrases describe remote locations, but they differ in scope and tone. 'The sticks' (from 'the sticks and stones' of the forest) is mildly humorous or self-deprecating — city-dwellers use it to tease the countryside, and country-dwellers use it to joke about their own situation. 'The middle of nowhere' is more neutral and can describe any isolated spot, including a desert or a mountaintop, not just farmland. 'The boonies' (military slang from 'boondocks,' a Tagalog word for mountain) is very informal and American; it carries a stronger sense of being uncivilised or backward. 'The backwoods' specifically suggests a wooded, hard-to-reach area and often implies a lack of modern education or sophistication. For everyday conversation about rural living, 'the sticks' is common across both British and American English.
Etymology
The phrase 'the sticks' is short for 'the sticks and stones' of the forest, used figuratively from the early 1900s to mean a remote wooded area. The idea is that such a place has no buildings or pavements — only trees and rough ground. By the mid-20th century it had become a common informal term for the countryside far from any town.