Seltannasaggart is possibly best viewed from afar, as the summit area is one of the most industrialised in Ireland. Besides the plethora of windmills, there are huge areas of exposed shale where the bog was scraped off, large deposits of sand and stone and lots of sheds, machinery, spare windmill parts and litter. It can be reached from an access road at G924184 A which leads to the top, or by hiking over three kms of rough bog by starting at G 87439 21661 B. Linkback: https://mountainviews.ie/summit/698/comment/5457/

Climbed this mountain !! when seeking out the highest point in Roscommon ( refer also to Seltamasaggart SE Slope). It is crossed by part of the Miners Way and, as already indicated in other comments, is a bit of a wasteland. Start at G2895019100 C. Once there you may well ask , why did I bother? At least now, thanks to the new County Tops Listing by MV there is a well defined purpose for summiteers seeking out this hill. The photo shows what to expect on the top. If you really want to stand on the higest point, at spot height 426m, I recommend you use a GPS and get it to direct you to the Grid Ref at G9016620113 D provided it has not been mined out of existence when you go and don't forget to seek out the highest point in Roscommon when you are there Grid Ref. G9030019600 E. Linkback: https://mountainviews.ie/summit/698/comment/4030/

Considering the summit area of Seltannasaggart seems to have all the geographical consistency of 'Brigadoon' I thought that some instructions for gaining this week's highest point might be in order. I deployed the previously mentioned start at (920191 F), and having used Mr Gribbon's book to locate the Roscommon high point I turned my attentions to the main summit. From the junction at (902197 G) follow the sign pointing to 'Moneenatieve Wind Farm: M20 - 25 1.5km ahead'. The gate mentioned by Gribbon seems to have gone but two metal posts either side of the track probably denote its former location. No matter: at the first junction encountered follow the sign for 'T6 - T8', and finally follow 'T6' at the next one: this can be translated as 'keep right at both of them'. From here a small cairn can be seen on the skyline on the right of the track (pimple just right of centre in the photo): keep going for a 100m or so and it's then very easy to walk up to it. This (for now) seems higher than all other surfaces nearby, although it's obviously an eminence of extracted earth rather than a natural part of the hill.

A hilltop that is simultaneously appallingly mutilated and horribly fascinating. Linkback: https://mountainviews.ie/summit/698/comment/14903/

Seltnasaggat, or Corry Mountain's, main claim to fame is that its Roscomon's highest point, so anyone with an eye on climbing the highest point in every county must come here. Aside from decent views over Lough Allen there is not much else to recommend it. It is the home of yet another wind farm, with dozens of the things about. It also has plenty of works going on, with plenty of machinery around the top of the mountain. There seems to be no distinct summit, and I spent a bit of time looking for it, but the top has been badly gouged by diggers and bulldozers. There is an access loop road to the top but if you are going to use it take the entrance at G924184 A not G920191 F as this half of the road is strictly tractor territory! Linkback: https://mountainviews.ie/summit/698/comment/2721/

Seltannasaggart is a ridge NW-SE. Just to the NW of the flattish plateau that marks its top a major bog-burst has occurred, pictured below. Large lumps of peat from the size of filing cabinets to the size of small cars lie strewn around, while the central area foreground has been swept clean.
There are mentions on the web of a landslide in 2008 - possibly this is it. Linkback: https://mountainviews.ie/summit/698/comment/3981/