I thought this was an interesting picture. There must be a lot of vegetables growing in this area especially carrots, as we saw people with a tumbler full of carrots.
The device (I call it a tumbler) was a large cylinder full of holes. They would back it into the water and rotate it to wash the carrots.
The Castle is the "Petrovaradin" in Novi Sad Serbia. The flag is obviously the Serbian flag.
As we get closer to Belgrade the right side of the river has steep sand stone cliffs.