Detailed Instructions: Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
Problem:Context: The Duke's Cut was completed by the Duke of Marlborough in 1789 to link the new canal with the River Thames; and, in 1796, the Oxford Canal company built its own link to the Thames, at Isis Lock.
Question: By which body of water is Oxford located?
Solution:
river thames