According to my Ordnance Survey Ireland map, Clooneenbaun in County Roscommon (where members of my family lived until 1908) sits on the 70 metre contour line. Lough Creevin, I km to the north, is 64 metres above sea level. Lough Slye, just south of the N61 is at 57 metres. As explained, and illustrated, in…