Lanark is a town in South Lanarkshire, Scotland, located 20 kilometres to the south-east of Hamilton. The town lies on the River Clyde, at its co…Lanark is a town in South Lanarkshire, Scotland, located 20 kilometres to the south-east of Hamilton. The town lies on the River Clyde, at its confluence with Mouse Water. In 2016, the town had a population of 9,050.