For information on fisheries with facilities for disabled anglers in Ireland go to:
Sorry folks just can't find anything for rivers in Meath
Sorry folks just can't find anything for still waters in Meath
Royal Canal at 146 miles long links the Liffey with the Shannon effectivly cutting ireland in half. Building it started in 1790 and finished 27 years latter a few years before railways arrived on the scene killing the canal.
The canal fell into disuse but in recent yaesr it has been revived as an amenity for boating and off course , fishing. The canal holds masses of fish along its length, big bream, rudd, roach, 8lb plus tench, big pike and carp.
Part of the canal runs through Meath and with a good tow path along its length there is good access to the fishing.
Of particular note in Meath is the stretch at Enfield where you will encounter some good carp in the harbour.
Google Satellite Royal Canal Enfield Harbour
Google Map 53.413941, -6.839940