Gartnanoul is a megalithic court tomb located in Killykeen Forest Park, Loughtee Upper, County Cavan, Ireland.

[2] Situated near Lough Oughter, the north tomb court is 3 metres (9.8 ft) in depth and 4 metres (13 ft) in width.

The roof stones are missing although the tomb is in good condition and cairn materials are found scattered around the tomb.

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