Megalithic tomb, Mondooey Upper, Co. Donegal
In the gently rolling pastures of Mondooey Upper, County Donegal, stands a puzzling megalithic structure that has intrigued archaeologists for over a century.
Megalithic tomb, Mondooey Upper, Co. Donegal
Five standing stones mark out what appears to be an ancient chamber, roughly four metres long and oriented east-northeast to west-southwest, possibly the remnants of a much larger gallery tomb. The monument sits in the corner of a field, with Mongorry Hill blocking views to the south whilst the land drops away northward towards Lough Swilly, some seven kilometres distant.
The current state of the monument tells a story of both ancient construction and later destruction. A low, gabled stone marks the western end of the chamber, with three orthostats forming the northern side and a single stone standing at the eastern end. Most notably, a massive displaced slab measuring 2.1m by 1.7m now rests on a smaller supporting stone to the south; this appears to be the same stone that George Kinahan documented as still standing on the south side when he surveyed the site in 1885. Several of the standing stones show cracks running from base to top, suggesting deliberate attempts at damage, whilst the middle stone on the northern side has been stepped inward from its neighbours, creating an irregular alignment.
Historical accounts provide fascinating glimpses of how the monument has changed over time. Thomas Fagan’s description from the 1840s indicates the tomb was already in its current damaged state, with the southern side stones prostrate, yet Kinahan’s later plan shows additional stones that have since vanished, including small orthostats outside the northwest corner and beside the middle northern stone. During investigations in 1982, a hole dug in the gallery floor revealed charcoal and heat-affected stones, though whether these represented ancient deposits remains unclear. Whilst some features suggest this might be the remains of a court tomb, with the western gabled stone possibly serving as a backstone and the eastern orthostat as a jamb, the monument’s true original form and purpose remain tantalisingly uncertain.





