Ordnance Survey Maps (River Thames Source).

Part of Oral Answers to Questions — Public Health. – in the House of Commons on 25th February 1937.

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Photo of Mr William Morrison Mr William Morrison , Cirencester and Tewkesbury

I understand that it is not an invariable rule in geographical practice to regard as the source of a large river the source of the tributary most distant from its estuary. I am advised that the source of the Thames or Isis is the spring known as "Thames Head," and that the leading authorities agree that the name of the stream which rises at Seven Springs is the "Churn." In these circumstances it does not appear that the alteration suggested would be justified.