The Green Hills was a range of hills that ran west-to-east through the Shire, through three of the Shire's four Farthings, and gave its name to the region known as the Green Hill Country. To the west, in the Tookland, the hills were fairly open and treeless. In contrast, their eastern slopes towards Woody End were densely wooded with trees of all kinds.
At least three rivers and streams had their sources among the Green Hills; the River Shirebourn, the Thistle Brook and the Stockbrook. One of the chief towns of the Shire-hobbits, Tuckborough, lay among the western hills, and other villages were to be found among their slopes, or about their feet, including Tookbank, Woodhall and Pincup.