CLACKMANNAN, the name of a small shire in Scotland, not exceeding eight miles in length, and five in breadth. It is bounded on the north by the Ochil hills; on the south, by the frith of Forth; on the east, by Perth-shire; and on the west, by Stirling-shire. The country is plain and fertile towards the frith, producing corn and pasture in abundance. It likewise yields great quantities of excellent coal, which is exported to England, France, and Holland. It is watered by the rivers Forth and Devon, and joins the shire of Kinross in sending a member alternately to parliament.