Rochussen Charles Regatta on the Maas Sun Charles Rochussen

The picture has something of this: watercraft, people, vehicle, group, water, many, river, transportation system, rowboat, ship, flag, landscape, military, harbor, boat, fisherman, man, fishing boat.
Perhaps it’s a painting of a group of people standing on a beach next to a body of water with boats in the water and flags flying in the air.