Simplify the following text for a Grade 10 native English-speaking person.
Original: The Wash is the square-mouthed estuary on the northwest margin of East Anglia on the east coast of England , `` where Norfolk meets Lincolnshire '' .
Simplified: The Wash is the square-mouthed bay and estuary on the northwest margin of East Anglia on the east coast of England , where Norfolk meets Lincolnshire .