French 19th century oil painting landscape, Barbizon School

Oil painting of a pastoral lakeside landscape. In the foreground three figures in a boat, one poling to shore, in the shade of an ancient oak tree. This charming but unsigned work is painted on canvas with a stretcher of typically continental form, which is indistinctly inscribed thereon. Now in a moulded gilt frame.
French, Barbazon School, circa 1830 – 1870