MULHAUSEN, a considerable town in Alsace, formerly capital of a republic in alliance with the Swiss. It is populous, and well built, seated in a pleasant fertile country, on an island formed by the river Ill, 15 miles north-west of Basle. It was united to France in 1798, and belongs to the department of the Upper Rhine. E. Long. 7. 24. N. Lat. 47. 48.