Langholm, also known colloquially as the "Muckle Toon", is a burgh in Dumfries and Galloway, southern Scotland. Langholm lies between f…Langholm, also known colloquially as the "Muckle Toon", is a burgh in Dumfries and Galloway, southern Scotland. Langholm lies between four hills in the valley of the River Esk in the Southern Uplands.