St. Connell's Well consists of a simple oval spring, carefully lined with drystone walls that have protected this sacred water source for generations. The well takes its name from St. Connell, though like many Irish holy wells, the exact history of its dedication has been lost to time.

The well's companion, a substantial cairn measuring 7.8 metres by 3.6 metres, stands as a silent guardian over the spring. This unclassified cairn near Cill Charthaigh represents the kind of prehistoric monument that dots the Donegal countryside; its original purpose remains uncertain, though such structures typically date from the Bronze Age and often marked burial sites or territorial boundaries. The pairing of the prehistoric cairn with the later Christian well demonstrates how Ireland's sacred sites have been continuously venerated and repurposed across millennia.

Archaeological surveys have documented countless examples of this spiritual continuity throughout Donegal, where holy wells frequently appear near older monuments. These wells served practical and ritual purposes for local communities, providing both clean water and a focal point for religious observance. St. Connell's Well, with its careful stone lining and enduring spring, represents the kind of vernacular sacred architecture that rural Irish communities maintained well into the modern era, blending ancient reverence for natural springs with Christian devotion.