- Corca Duibhne
- Corcaguiny, Co. Kerry.
- Corrslieve
- Carlow Mountains.
- Crotta Cliach
- Galtee Mountains.
- Cruachan
- Co. Roscommon.
- Cruachan Aigle
- Croagh Patrick.
- Doire a Cairn
- Derrycarn, Co. Meath.
- Doire-da-Bhoth
- In Slieve Echtge.
- Druim Cleibh
- Co. Sligo.
- Druim Lis
- Near Loch Gill.
- Druimscarha
- Near River Arighis, Co. Cork.