West Lothian (Scots: Wast Lowden, Scottish Gaelic: Lodainn an Iar) is one of the 32 council areas of Scotland, and one of its historic counties. The county, which was also known as Linlithgowshire, was bounded by the Avon to the west and the Almond to the east. The modern council area occupies a smaller area, with areas in the west transferred to Falkirk and areas in the east transferred to Edinburgh following local government reforms in the late 20th century. It did however gain areas from Midlothian.

West Lothian lies on the southern shore of the Firth of Forth and is predominantly rural, though there were extensive coal, iron, and shale oil mining operations in the 18th and 19th centuries, which created distinctive red spoil heaps (locally known as "bings") throughout the council area. The old county town was the royal burgh of Linlithgow, but the largest town (and the second largest town in Lothian after Edinburgh) is now Livingston.

The council area borders, in a clockwise direction, the council areas of Edinburgh, the Scottish Borders, North and South Lanarkshire, and Falkirk. The county bordered Midlothian, Edinburgh, Lanarkshire, and Stirlingshire. Its eastern border with Midlothian was formed by the Briech Water, from its source until it reached the Almond, and it then followed the Almond to the Forth (except by Livingston, where Midlothian intruded about a mile past the Almond to include the hamlets of Howden, Craigshill, and Pumpherston). The southern border was mostly arbitrary, while the western border was formed first by the Drumtassie Burn and then by the Avon. It had an area of 120 sq. miles (310 km²), making it the third smallest of Scotland's 33 counties and smaller than the modern council area. Significant towns not included in the council area are the coastal burghs of Bo'ness and Queensferry and the town of Kirkliston.

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