(; ), formerly Western Isles, is a constituency of the House of Commons of the Parliament of the United Kingdom, created in 1918. It elects one Member of Parliament (MP) by the first past the post system of election. With around 21,000 registered voters, it has the smallest electorate of any constituency in the United Kingdom. It is expressly protected from being combined with other constituencies by the 2011 Parliamentary Voting System and Constituencies Act. History The constituency was formed by merging areas which were formerly within the Ross and Cromarty constituency and the Inverness-shire constituency. is Scottish Gaelic for the , which was the constituency's name prior to the 2005 general election. An identical constituency with the same name is used by the Scottish Parliament. Boundaries The constituency area is that of the Outer Hebrides, known also as , and the constituency has the smallest electorate in the United Kingdom, one-fifth of the size of the largest, the Isle of Wight, which is also an island constituency. However, the Isle of Wight is a substantially smaller parliamentary constituency in geographical terms. It has been suggested that Na h-Eileanan an Iar could be combined with the Orkney and Shetland constituency: the resulting combined electorate would still be well below the average constituency quota. The seat's entire turnout at elections will be less than a winning candidate's vote in a rural English seat. The Scottish Boundary Commission in 1980 proposed that the seat should be extended to include the Skye and Lochalsh areas; this was overturned at a public enquiry. Generally, considerations of geographical size, a disparate population and convenience for the MPs concerned, as well as tradition and identity, have tended to override the arguments about numerical imbalance. Furthermore, a change in the Boundary Commission's rules in 2000 added a rule which forbade Orkney or Shetland being combined with another council area. In 2011, the Parliamentary Voting System and Constituencies Act 2011 was introduced, which prevented both Na h-Eileanan an Iar and Orkney and Shetland from being combined with any other constituency. Local government areas When created, the area of the constituency was divided between two local government areas: the counties of Ross and Cromarty and Inverness-shire. The division line was the Lewis-Harris boundary, with Lewis in Ross and Cromarty and Harris in Inverness-shire. In 1975 the constituency area became also an island council area, known as the Western Isles