It extends 420 miles ( 675 km ) north-south by 520 miles ( 837 km ) east-west and has a total surface area of 110,000 square miles ( 280,000 km2 ) , to a maximum depth of 20,300 feet ( 6,200 m ) .
It is 420 miles ( 675 km ) north-south by 520 miles ( 837 km ) east-west .