In a medium long shot, we see a view of the Seine, with some logs floating. Perhaps they are rubbish. Swimmers enter from the right, get as far as the logs and turn back.
It's an early actuality, like many movies of this era, and therefore needs to be judged against the best of the type: the Lumieres' films, with their fine composition and carefully choreographed movement. This one does not begin to measure up.