It has a height of 784 metres (2,572 ft) and lies southwest of MacGillycuddy's Reeks.

The mountain is named after a small lake called Loch an Dúloigh or Lough Duff.

[4] The mountain's alternative name Maol means "bare flat-topped hill".

West of Stumpa Dúloigh the Dunkerron range splits in two parts: the NE one leads to Broaghnabinnia (745 m) while the SE sub-range reaches Knocknabreeda (569 m).

Stumpa Dúloigh's summit can be accessed from the end of the Black Valley; it is a 6 hours' walk (there and back) suitable only for experienced hikers.