If you are on the Sligo to Manorhamilton Road there is a layby where you can stop the car and look over Glencar Valley. You might spot the Celtic Trinity Knot tree design.
This was planted in the mid 1980s by the McCabe Family. They planted that whole hill (known as ‘Tormór’), and planted the design in the centre (Celtic Trinity Knot) with Japanese Larch on Sitka Spruce. They plotted the hill using white plastic bags, ground pegs and a two-way radio to give instructions from the opposite layby on the N16. The Glencar area is divided between Co. Sligo & Co. Leitrim, this design & surrounding property is in Co. Sligo. It was privately funded/planted for the enjoyment of all & the Celtic design comes out best in autumn when the Japanese Larch change colour. source: A.MacCabe, Glencar, Co.Sligo
It’s also well worth a drive down into the valley to see Glencar Waterfall (this is in Leitrim) and Sruth in Aghaidh An Aird – The Devil’s Chimney Waterfall.