SCHWARTENBURG, a town and castle of Germany, and circle of Upper Saxony, in the landgrave of Thuringia, and capital of a county of the same name belonging to a prince of the house of Saxony. It is situated on the river Schwartz, 20 miles south-east of Erford, and 35 north of Cullembach. E. Long. 11. 27. N. Lat. 50. 45.