CASTLE DOUGLAS, burgh of barony, Kirkcudbrightshire, Scotland. Pop. (1931) 3,008. It is situated on Carlingwark loch, 19j m. S.W. of Dumfries by the L.M.S.R. Its auction marts for sheep and cattle sales are the largest in the south-west of Scotland. The leading industries include the making of agri cultural implements and tanning. The town is the chief centre of business in East Galloway, and it is also visited in summer for its scenery and fishing. Till 1765 it was only a village under the name of Causewayhead, but the discovery of marl in the lake brought it some prosperity, and it was purchased in 1792 by Sir William Douglas and called after him. Carlingwark loch contains several islets, on one of which is a crannog, or ancient lake dwelling.