Simplify the following text for a Grade 7 native English-speaking person.
Original: The eastern coast of the Wash is entirely within Norfolk , and extends from Hunstanton in the north to the mouth of the River Great Ouse at King 's Lynn in the south .
Simplified: All the eastern coast of the Wash is in Norfolk , and goes from Hunstanton in the north to the mouth of the River Great Ouse at King 's Lynn in the south .