The canvas has been cut down on the right, where a right arm with a stick and the right leg of a man are visible. This is probably a late work. The figures may be by Jan Lingelbach, who frequently painted figures in Koninck's and other artists' landscapes. If they are by him, the picture must have been painted before 1674, when Lingelbach died.
The National Gallery, Trafalgar Square, London WC2N 5DN