This painting has a reverse
The river depicted here is almost certainly the Oise, near Auvers in France. The boat in the right middle distance is 'Le Botin', a small ferry which Daubigny converted into a studio-boat in 1857. He used it for travelling up and down rivers such as the Oise and painted many river scenes from it, working directly from nature.
The National Gallery, Trafalgar Square, London WC2N 5DN