What is the widest point on river thames?

The widest point on the River Thames is at the Thames Estuary. The Thames Estuary is a coastal plain and river delta in the southeast of England, extending about 105 km (65 miles) from the Isle of Dogs east to the North Sea between the counties of Essex and Kent. The Thames Estuary covers a total area of about 1,700 km2 (660 sq mi).