Overview. Slí Mór is a Pilgrim’s Road from Ballycumber to Clonmacnoise, that has been used by pilgrims for centuries. It is a pleasant Pilgrim journey beginning in Ballycumber village, and passing through Boher with the Shrine of St Manchan leading on to the monastic site at Clonmacnoise. The best scenery comes on the final stretch along the Esker Riada from Bishop’s Hill to Clonmacnoise. The route is entirely on public roads so it may be cycled or walked while still remaining within the spirit of a pilgrim journey.
Grade. Easy: terrain contains nothing to challenge the rambler or leisure cyclist. 
Distance. 22 kilometres
Time. Walk time: 4 – 5 hours. Return transport required from Clonmacnoise.
Cycle time: 1 to 1.5 hours, for a one-way journey.
Trailhead. Ballycumber village, Co Offaly, which lies at N620 730 on the R436 between Clara and Ferbane.
Finish. The monastic site at Clonmacnoise.