Knocknapeasta lies high above the Hag's Glen to the N and the Black Valley to the S. It's conical, rocky summit is the end point of the most challenging ridge walk in the country. However, access from other directions is easier. Great views esp. of the Big Gun, Carrauntoohil, Purple and indeed much of Corca Dhuibhne and Beara can be visible.

N. Park at Cronin's Yard V83608 87337 A or Lisleibane V82707 87311 B and follow the obvious track towards Hag's Glen. You've a few choices from here :
a) to avoid the challenge of the arête head into the glen as far as approx. V82303 85034 C and from here head SE up The Bone. The route is fairly obvious and as you ascend it becomes narrower and the track more obvious. If taking this route down be very careful to keep right at around V83100 83899 D.
b) leave the track at approx. V83047 86583 E and head for Loch Cummeenapeasta. If you care to take on The Big Gun go E at the lake and head steeply up a huge boulder field [rock hopping is easier than finding a way around] to the summit of Cruach Mór. See comments on CM and TBG for more details. 3 to 4 hours.

If you'd prefer to avoid the arête go to the right side of the lake and ascend the equally steep NW spur of K. 2.5hrs +

SE Park with care near V85642 82670 F E and strike out NW up a long, well-defined spur to Feabrahy. Expect steeper ground thereafter - a slog will take you to the col to the SW of the summit. Allow 2hrs+

Notable tracks incl. track/4190. track/3529 and track/3790. Linkback: https://mountainviews.ie/summit/4/comment/4764/