You've heard of the way to count seconds with "One Mississippi, two Mississippis," and so forth.  There actually are two Mississippis, with light and dark halves.  This map is from Mississippi Delta Junior College's 1964 yearbook.  Apparently, "two Mississippis ... emerged in the late twentieth century" (Bradley Bond, Mississippi).  And "the two Mississippis, one black and one white, converged momentarily" (Alan Draper, Conflict of Interests).  You may previously have heard of the "two Mississippis of William Faulkner and Eudora Welty."  It's even been said that Faulker himself had two Mississippis, his mythical one and his geographical one.

"Somehow I have to face up to these two Mississippis: the one I love and the one I hate" —W. Ralph Eubanks, Ever Is a Long Time