The Isis

"The Isis" (/ˈsɪs/) is an alternative name for the River Thames, used from its source in the Cotswolds until it is joined by the Thame at Dorchester in Oxfordshire. It derives from the ancient name for the Thames, Tamesis, which in the Middle Ages was falsely assumed to be a combination of "Thame" and "Isis".[note 1][1] Notably, the Isis flows through the city of Oxford.

Punting on the Isis at Oxford.
Map of Oxford c. 1900, with the river labelled as "River Thames or Isis".
Rowing on the Isis opposite the Oxford college boathouses.

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