Simplify the following text for a Grade 8 native English-speaking person.
Original: The Chesapeake Bay is approximately 200 miles ( 300 km ) long , from the Susquehanna River in the north to the Atlantic Ocean in the south .
Simplified: The Chesapeake Bay is about 200 miles ( 300 km ) long , from the Susquehanna River in the north to the Atlantic Ocean .