The 1:25000 map shows a clear boundary running along the length of Druim Gleann Laoigh, but it's just a line of rusty fenceposts to the west of this point. From here for a couple of miles along the ridge, it runs as a low stone wall, mostly in good order.
Uploaded to Geograph by Richard Law on 23 April 2016
Photo © Richard Law, 23 April 2016. Licensed for reuse under this Creative Commons licence