Witch Hill is located just east of the Graveyard keeper's homestead. It is supposedly the location of the portal.
Areas of Interest
The vineyard is located on the first level of the hill. You can use it without the inquisitor's permission, but you can unlock the workbench there after the raising moral quest. If you are not friends with him, you can use it without additional quests, but you won't be able to build new vine trelisses there.
There is a burnt house on the second level of the west side of the hill. There is a single grave next to the house.
The ruins are located on top of the hill. It is the location of the portal. The inquisitor and his guards perform the witch trials every . The guards keep their watch there, until you bring them some wine.
There are two sources of infinite marble on both sides of the ruins atop the hill.