CLACKMANNANSHIRE, the smallest Co. of Scotland, extending 10 miles N. and S. between the main body of Perthshire and the river Forth, and 11 miles E. and W. between the cos. of Stirling and Fife; area, 30,477 ac.; pop. 25,680, or 539 persons to each sq. m. The surface rises from the Forth by an easy ascent, broken by gentle undulations and by the valley of the river Devon, to the Ochil Hills, which extend along the N. border. These hills afford excellent pasturage; the low grounds are well cultivated. Coal is raised in the Devon valley; the towns of Alloa and Tillicoultry have woollen mfrs.