the cheasapeke bay
Lake Michigan divides Michigan in 2 sections.
The equator
4 sections but there are some that split in half
Chesapeake Bay, an arm of the Atlantic Ocean, extends through the states of Virginia and Maryland nearly as far as Pennsylvania. The bay divides the mainland areas of these states from their counties on the Delmarva Peninsula.
Michigan.
Barline
michigan. it divides the island part and the actual land.
The Chesapeake Bay seems like it divides Maryland into two.
The Atlantic Ocean
The Appalachians.
Line of demarcation
A horizontal plane.