Drummully or Drumully (Irish: Droim Ailí; "rocky ridge") is an electoral division (ED) in the west of County Monaghan in Ireland. Known as the Sixteen Townlands to locals and as Coleman's Island or the Clonoony salient to the security forces, it is a pene-enclave almost completely surrounded by County Fermanagh in Northern Ireland. Since the Partition of Ireland in the 1920s, the Monaghan–Fermanagh border has formed part of the international border between the Republic of Ireland and the United Kingdom, leaving Drummully as a practical enclave, connected to the rest of what is now the Republic of Ireland only by an unbridged 110 metres (360 ft) length of the Finn River. The area is accessed via the Clones–Butlersbridge road, numbered N54 in the Republic and A3 in Northern Ireland.