JONKÖPING, a laen in the southern part of Sweden, bounded on the N. by Mariestad, Lake Wetter, and Linköping, E. by Kalmar, S. by Wexiö, and W. by Halmstad and Wenersberg. Area 4275 square miles. A great part of the surface is rocky and mountainous, but other parts are of considerable fertility, producing grain sufficient for the wants of the people, as well as potatoes, hemp, flax, and buckwheat. It is rich in minerals, particularly iron, which is worked to a considerable extent. The woods are extensive and furnish deals, pitch, tar, and potash for exportation; cattle, butter, and cheese, are also among its exports. Pop. (1850) 163,426.