Serpentine river swim

Not in exact words, and more probably very inexactly, but in 'The Portrait of a Lady" didn't Henry James write that Londoners call the Thames 'the River' and those not familiar with, nor living in London call it 'the Thames'?

Attached below pictures of Serpentine swimmers in the river

Hat-tip to Jenny Rice for the photos 

Yours swimmingly

(JohnTierney AT swim DOT com)