East Dakota

Etymology
From the analogy with and.

Proper noun

 * 1) A  U.S. state that would be east of the.
 * 2)  The area of western Minnesota which mainly consists of the Red River (of the North) valley.
 * 1)  The area of western Minnesota which mainly consists of the Red River (of the North) valley.
 * 1)  The area of western Minnesota which mainly consists of the Red River (of the North) valley.
 * 1)  The area of western Minnesota which mainly consists of the Red River (of the North) valley.

Usage notes
This mythical state, along with similar constructions, is often used in textbook sample cases to avoid confusion with an actual existing state.