four corners

Short definition from Wiktionary

Noun

1. 1
   The face of a document or its contents, considered without reference to any outside information.
2. 2
   A major intersection and/or economic center in a town

Proper noun

1. 1
   The quadripoint at the borders of Colorado, New Mexico, Arizona and Utah, and the region surrounding it.
2. 2
   A type of patience card game.