This circular stone mound measures roughly 31 metres north to south and 8 metres east to west, rising to about 1.4 metres in height. Atop the cairn stands a distinctive cross-shaped stone slab, nearly a metre tall, with geometric bar decorations incised into its northwestern face below the arms. The entire site occupies rough pasture in mountainous terrain, forming part of a turas (pilgrimage route) that stretches almost three miles through the landscape.

The well has been a place of pilgrimage for centuries, with Monsignor Stephens noting it as the spot where St. Columbkille would retire for rest and prayer in what was known as his ‘Stone Bed’. Local tradition holds that when the saint lived in the glen, he sustained himself on three simple foods: dubhlaman (a type of edible seaweed) from Carraig Chormadain, water from Gort a’ Deochadain, and wild clover from the dunes. According to folklore recorded by Ó Muirgheasa in 1936, Columbkille blessed the dubhlaman with miraculous properties; during the Great Famine, locals could harvest it completely each day, only to find it had regrown fully by the following morning.

The site continues to attract pilgrims who follow the ancient turas route, climbing the steep ascent of Cruach a Chullain towards the dramatic headland of Glen Head. The combination of natural setting, religious significance, and enduring folk memory makes this holy well one of the more evocative early Christian sites in Donegal, where the boundary between history and legend remains beautifully blurred.