​KÖNIGSBORN, a spa of Germany, in the Prussian province of Westphalia, immediately to the N. of the town of Unna, of which it practically forms a suburb. It has large saltworks, producing annually over 15,000 tons. The brine springs, in connexion with which there is a hydropathic establishment, have a temperature of 93° F., and are efficacious in skin diseases, rheumatism and scrofula.