title: River Orwell
context: The River Orwell flows through the county of Suffolk in England. Its source river, above the tidal limit at Stoke Bridge, is known as the River Gipping.[1] It broadens into an estuary at Ipswich where the Ipswich dock has operated since the 7th century and then flows into the North Sea at Felixstowe the UK's largest container port after joining with the River Stour at Shotley forming Harwich harbour.
question: Where does the River Orwell end?
answers: North Sea