vintage map the thames showing estuary below tilbury 1930s

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Vintage map of the Thames showing the estuary below Tilbury 1930s.

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.