From Killarney take the Kenmare road as far as Muckross and then take the first sharp left after Molly Darcy's pub. Drive uphill to a fork in the road with a sign for Mangerton. Take the road to the right and drive along this road until you see a rough track heading off to the left (V984 848 A) just after a track on the right. There's plenty of parking here along the road or at the start of the track.

This track will take you to the Devil's punchbowl. The start of the walk presents you with a gradual climb as the track meanders either side of a largely dry riverbed. The Lakes of Killarney emerge spectacularly on your right as you gradually gain height. The track winds on upwards until you eventually reach the punchbowl.You then turn right and climb above the western ridge with a precipitous drop to your left and bear south west for Mangerton's summit. From Mangerton cross north east to the cliff edge , there is a faint track skirting the corries as you turn east, then north at the lowest point to Stoompa.The bog has been eroded along this edge so it makes for easier walking.
Be very aware of the cliffs to your left. This is the area where a Swedish walker fell to his death in 2006.

To return to your starting point, head north from the summit, over a subsiduary top and steeply down to the outflow of L. Garygary. From here head west along a rough, heathery shelf to rejoin the Punchbowl track near V984 839 B. Linkback: https://mountainviews.ie/summit/105/comment/4865/