Located in the eastern north-central US, Wisconsin ranks 26th in size among the 50 states.
The total area of Wisconsin is 56,153 sq mi (145,436 sq km), of which 54,426 sq mi (140,963 sq km) is land and 1,727 sq mi is (4,473 sq km) inland water. The state extends 295 mi (475 km) E-W and 320 mi (515 km) N-S.
Wisconsin is bordered on the N by Lake Superior and the state of Michigan (with the northeastern boundary formed by the Menominee River); on the E by Lake Michigan; on the S by Illinois; and on the W by Iowa and Minnesota (with the line defined mainly by the Mississippi and St. Croix rivers).
Important islands belonging to Wisconsin are the Apostle Islands in Lake Superior, and Washington Island in Lake Michigan. The state's boundaries have a total length of 1,379 mi (2,219 km). Wisconsin's geographic center is in Wood County, 9 mi (14 km) SE of Marshfield.