It allowed ships to reach far inland
London isn't, but it is at the beginning of the Thames estuary.
London is on the River Thames but not quite at its estuary.
It allowed ships to reach far inland
The Thames Estuary.
The river Thames arises in Gloucestershire at Thames Head, which is a small spring, and flows through London and out into the North Sea at the Thames estuary
No. Southend beach is in Southend-on-Sea which is a town on the Thames estuary about 30 miles east of London.
The Thames estuary is at the end of the River Thames, in England.
It starts somewhere near Cirencester and ends at its estuary to the East of London.
Thames Estuary
Thames Estuary.
It allowed ships to reach far inland
The tidal section is from the sea to about 90 kms upstream to Teddington