Vintage Map Of The Thames Showing The Estuary Below Tilbury 1930s. Editorial Photo

Estuary of the Thames - Map of the estuary of the Thames below Tilbury, showing the many shallows which make navigation difficult. The River Thames, known alternatively in parts as the River Isis, is a river that flows through southern England including London. At 215 miles, it is the longest river entirely in England and the second-longest in the United Kingdom, after the River Severn.