[2] In addition, Tempan found no particular evidence of any other Irish language names behind Stoney Top except to note that there was a cross-inscribed standing stone between Stoney Top and the summit of Tonelagee.

Tonelagee is the third highest peak in the Wicklow Mountains, and is situated in southern-end of the central section of the range.

[6][8] Tonelagee's prominence of 202 metres (663 ft), qualifies it as a Marilyn, and also ranks it as the 15th-highest mountain in Ireland on the MountainViews Online Database, 100 Highest Irish Mountains, where the minimum prominence threshold is 100 metres.

[6] One of Tonelagee's most distinctive features is its deep north-eastern corrie, which contains the "heart-shaped" natural lake of Lough Ouler at 596 metres (1,955 ft) (not as high as Wicklow's highest natural lake of Cleevaun Lough at 686 metres (2,251 ft), on Mullaghcleevaun).

The route crosses the Glenmacnass River to reach Tonelagee's north-east corrie and Lough Ouler, from where it then summits via the northern edge of the corrie rim to the summit of Tonelagee (passing the mica-shist "standing stone" along the way); the descent is via Tonelagee NE Top and then directly down to the shoulder to the Glenmacnass Waterfall car park.