Possibly lost now, but maybe it's there just under the surface waiting to be rediscovered, full of moss and dirt, waiting to twist your ankle?
Here (Fig. 19) is a representation of a Bullan situated, and almost buried, in the centre of a low earthen mound upon the northern side of Loch Drumgay. The material is red sandstone - diameter of basin, one ft. three in.; depth, eleven in. This mound has all the appearance of [a] pagan site. The spot is considered very sacred, though far apart from church or cemetry; and the usage is, that after the patient or pilgrim has prayed and laved, the rag used in applying the water to the eye or eyes must be hung upon one of the surrounding white-thorns. At the time of my visit, in December, 1874, several such tattered offerings yet remained, showing that the place had been still recently resorted to for cures.
On Certain Markings on Rocks, Pillar-Stones, and Other Monuments, Observed Chiefly in the County Fermanagh
W. F. Wakeman
The Journal of the Royal Historical and Archaeological Association of Ireland
Fourth Series, Vol. 3, No. 23 (Jul., 1875), pp. 445-474