Situated in the eastern north-central US, Illinois ranks 24th in size among the 50 states. Its area totals 56,345 sq mi (145,934 sq km), of which land comprises 55,645 sq mi (144,120 sq km) and inland water 700 sq mi (1,814 sq km). Illinois extends 211 mi (340 km) E-W; its maximum N-S extension is 381 mi (613 km).
Illinois is bounded on the N by Wisconsin; on the E by Lake Michigan and Indiana (with the line in the SE defined by the Wabash River); on the extreme SE and S by Kentucky (with the line passing through the Ohio River); and on the W by Missouri and Iowa (with the entire boundary formed by the Mississippi River).
The state's boundaries total 1,297 mi (2,088 km). The geographic center of Illinois is in Logan County, 28 mi (45 km) NE of Springfield.