There are several early oratories near Oughterard.
There is St Cummin's (8C) monastery at Kilcummin where there is a mediaeval church OS 45 134 423
At Portcarron near the shore of Lough Corrib is a large enclosure and the ruins of an early oratory OS 45 147 434
St Croine was a virgin saint and recluse of the 6C church in the Carlow/Wicklow area. There are the ruins of a mediaeval church
OS 45 148 407
St Brecan had an oratory at Rosscahill East OS 45 172 382
Another oratory is to be found at Boleyvaunaun OS 45 186 379
St Annin's mediaeval church is to be found at Killannin OS 45 189 376
At Killcallin is a ruined mediaeval church OS 45 193 350
At Moycullen are the ruins of a church with a trabeate doorway
OS 45 234 315
At Moycullen also is a mediaeval church OS 45 230 331
St Einne (Enda) is a recently discovered oratory with Holy Well, a possible outdoor altar and Bullaun OS 45 211 308
All this information, including pictures, has been provided by Anthony Previte.
Many of these sites are heavily overgrown. However they do give a picture of a thriving monastic area close to the Lough from early times.