Gamma Forests

The Gamma Forest was a location inhabited by humans with a separate culture.

Culture
The girls from the Gamma Forest were sometimes known as "Gamma Girls". It was "Heaven-neutral", referring to its neutral stance towards recruitment for the Church. The people there were known to craft handstitched cloth symbols of devotion called "prayer leaves". These were embroidered with the names of one's children in the native tongue of the people of the Gamma Forests, as a sign of belief that child would always come home to them.

A few facts were known of the Gamma Forest language. Doctor was translated as "mighty warrior", while the only word for "pond" translated to "river". (DW: A Good Man Goes to War)

History
When Lorna Bucket was a child, she met the Doctor in the Gamma Forest. She recalled that he repeatedly told her to "run". She also claimed that the reason she enlisted in the Church was partly because the Doctor's short visit to the forests was the only thing that had ever happened there. Lorna later crafted and gifted a prayer leaf to Amy Pond, who had recently been separated from her newborn daughter. Later as Lorna died, the Doctor pretended to recall their adventure there, despite the fact he had not yet met Lorna in his own timeline. (DW: A Good Man Goes to War)