This M Loop is the longest hiking trail in the Highland Forest County Park system.  It is a mild trafficked loop. With technical terrain, creek.  Is extremely muddy especially early spring. Great views and so peaceful. 

Trails map:  https://www.onondagacountyparks.com/assets/Uploads/HF2016TrailMaps.pdf

Ireland's longest coast-to-coast walking and cycling trail, 1000km/620miles long, covering the length of the island.  The Ireland Way joins the newly developed Beara-Breifne Way to the Ulster Way on the island of Ireland. The trail goes from the Beara Peninsula in County Cork, Republic of Ireland to Ballycastle, County Antrim in Northern Ireland.

https://www.theirelandway.ie/