Dooish is the highpoint of a jumble of peaks beside Lough Veagh. Its N slopes are boggy, steep and inhospitable but the summit is rocky and a pleasure to walk. The views are stunning esp. of Errigal, the Aghlas, Muckish and, further afield, the Bluestacks and some offshore islands. You will need to head to its SE top to get a view of Glenveagh. Watch out for golden eagles too.

NW. Park at about B96522 21277 A, head across the bog, and climb steeply aiming for Dooish SW Top. From here follow the obvious ridge to Dooish over easy, pleasurable terrain - a mixture of flattish rock and grass with a few defiles en route. Allow 1 – 1.5 hours.
Or, more directly, start anywhere along the R251, head steeply through similar terrain aiming for the obvious col and deer fence at B97231 20738 B. Head E along easy terrain to the summit. Allow 1.25hrs+

N. Park at approx. B98371 22731 C. cross the river and make a beeline for the summit of Saggartnadooish. Drop SW to the col by a lake and then head W for Dooish. 1.5hrs+
Also from Saggart. you can head E taking in its E top as well as Dooish SE top before ascending D. The terrain is easy enough in this region. 2.5hrs+

S. Get to approx. B99345 18281 D either by bicycle or bus from the Park Visitor Centre or park at B97098 15812 E and walk NE along a trail. From the starting point, head N, crossing the river and walk up the steep slopes to Dooish SE - from here it's an easy stroll to D. 1.5hrs
Notable tracks incl. track/2765 and track/3872 Linkback: https://mountainviews.ie/summit/187/comment/4947/