That would be the river Ems in the Netherlands.
The Meuse River flows into the North Sea. It begins with the letter M.
The Elbe River flows into the North Sea
The three-letter river that starts with "E" and flows to the North Sea is the River Ems. It is located in northwestern Germany and flows into the North Sea near the town of Emden. The river is significant for local navigation and is part of the larger Ems-Jade Canal system.
The River Thames flows into the North Sea.
The River Thames flows into the North Sea between the Counties of Kent and Essex.
It is the Mackensie River.
No ocean flows into any river. The Humber flows into the North Sea
The river Thames is not joined to any ocean it flows into the North Sea
this river is Located in Europe it flows north. It is the Rhine River
The river Thames flows through London and discharges into the North Sea.
The Lina River
The Rhine River flows into the North Sea near Rotterdam in the Netherlands.