It is a small, hilly riverside area that includes the ruins of a house just north of the San Luis River in southwestern Hennigan's Stead. Nothing is known of how the house came to be so dilapidated or why it was abandoned.
- Despite the house being in complete ruins, horses and animals cannot enter it. This makes it an ideal place to run if overwhelmed by boars.
- A chest in the Greenhollow house holds $15 - 25.
- There is a mystery bottle that appears to be of Nigel West Dickens' elixir in the chimney of the ruins.
- It is extremely dangerous to put down bait at Greenhollow at night, because a cougar may arrive and attack or kill the player.
- The player can hear some men around New Austin say "I want to know who owns that property at Greenhollow", implying that they may be interested in buying Greenhollow.
- Alvin McCready mentions that he wants to talk to the law about new strangers here.
Uncover every location on the map in Single Player.
Attain 100% List in the singleplayer game completion list.