Turner’s painting captures Christ Church’s Canterbury Gate from Oriel Square. (As it happens, this is Canterbury Gate at Christ Church in Oxford and, conversely, there is a Christ Church Gate at Canterbury in Kent.)
Given the greenery of the vegetation, this is almost certainly not the work that inspired Betjeman to write his winter poem ‘On an Old-Fashioned Water-Colour of Oxford’:
A late, last luncheon staggers out of Peck
And hires a hansom: from half-flooded grass
Returning athletes bark at what they see.
But we will mount the horse-tram’s upper deck
And wave salute to Buols’, as we pass
Bound for the Banbury Road in time for tea.