Castle Huntly is a castle in Scotland, now used as a prison under the name HMP Castle Huntly. It is located approximately 7 miles (11 km) west of Dundee in the Carse of Gowrie, Perth and Kinross, close to the shore of the Firth of Tay, and can be seen from the main road linking Dundee and Perth. The castle sits on top of a rocky outcrop surrounded by what is now farmland. In ancient times this land was marshy wilderness and the decision to locate the castle on the rock may have been taken with a view to the castle's defensive position in mind.