The Green Hills was a range of hills that ran through the Shire, crossing three of the four farthings. They gave their name to the region known as the Green Hill Country.

To the west the hills were fairly open and treeless, but in their eastern region, they were densely wooded.

At least three rivers and streams had their sources among the Green Hills; the River Shirebourn, Thistle Brook and the Stock-brook. Tuckborough lay among the western Green Hills, and other villages were to be found among their slopes, or about their feet, including Tookbank, Woodhall and Pincup.