Goodhue County is in the southeast triangle of Minnesota.  There are several irregularities in its boundary lines,  but, generally speaking, it has Dakota County on the north, Wisconsin on the northeast, Wabasha County on the east, Dodge and Olmsted Counties on the south, and Rice County on the west.  The Mississippi River and its enlargement, Lake Pepin, form its northeastern border and separate it from the State of Wisconsin.  Its area is 764 square miles.