Mongavlin Castle
| Mongavlin Castle | |
|---|---|
| Near Lifford, County Donegal in Ireland | |
Mongavlin Castle in June 2013 | |
| Site information | |
| Condition | Ruin |
| Location | |
| Coordinates | 54°54′15″N 07°27′12″W / 54.90417°N 7.45333°W |
| Designations | RMP DG063-009 |
Mongavlin Castle, also known as Mongevlin Castle, is a ruined castle on the west bank of the River Foyle, approx 3 km south of St Johnston, a village in the east of County Donegal in Ulster, the northern province in Ireland. Mongavlin was once a stronghold of the O'Donnells, Lords of Tyrconnell.