Culdee Fell is a Sudrian mountain. It has the reputation of being the highest point on Sodor, with its Summit 2,048 feet above sea level. The Culdee Fell Railway climbs this mountain's southwest side.
- Culdee is named after this mountain.
- Translated from Sudric, it means "The Mountain of the Companion of God". This most likely sources from the fact that St. Machan (the patron saint of Sodor, who lived during the sixth century) lived in a cave on the side of the mountain.