The Sentinel Hill State Park is a public park located in the outskirts of South Park. It made its first appearance in the Season Twenty-One episode "Sons A Witches" and it's second in "A Boy And A Priest"
The fathers of South Park, dressed up as witches for Halloween, go to the Sentinel Hill State Park for the first night of "Jack and Crack Witch Week", which consists of drinking Jack Daniel's and doing cocaine. While there, one of the men, Chip Duncan, uses a spell in a spell book and turns into an actual evil witch.
Later on, the men go back to the park for the second night of Witch Week, only to find that it has been temporarily closed down, leading the men to believe the town is on a "witch pursuit thing".
- Its name is a reference to a location in the video game World of Warcraft.