The term 'THE THAMES AT OXFORD' refers to the River Thames in Oxford, England. The river is a major tributary of the River Thames and is the longest river in the United Kingdom. It is also the second-longest river in England after the River Severn. The river is an important part of Oxford's history and culture, and is a popular tourist attraction. The crossword solution for this term is ISIS, which is the name of the stretch of the River Thames that runs through Oxford.