This fortification, built on a natural headland jutting into the Atlantic, represents a type of defensive structure particularly common along Ireland’s western seaboard. These coastal strongholds were strategically positioned to take advantage of natural cliff defences on multiple sides, requiring artificial fortifications only where the promontory connected to the mainland.

Promontory forts like An Meall Mór served multiple purposes throughout their use; they functioned as defensive positions, status symbols for local rulers, and possibly as trading posts along coastal routes. The exact dating of many of these sites remains uncertain without extensive excavation, though most are believed to date from the Iron Age through to the early medieval period. Until the full archaeological records become available online, this atmospheric site continues to guard its secrets as effectively as it once guarded the Donegal coastline.