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Thames is derived from middle English Temes which itself comes from the Celtic Temasis meaning dark. The "h" was added in the 14th century giving it a Greek look when the Celts were incorrectly believed to have come from Greece (there is a Greek river Thyamis). It is pronounced phonetically - Temz.

Thames Head, which is believed to be the source, is located near Cirencester in Gloucestershire. There is some doubt about whether this is the "true" source of the river several others having a claim (Trewsbury Mead and Severn Springs).

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9y ago

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