This is a picture of a ferry crossing a stretch of water somewhere – possibly one of the Scottish Islands?
It is a drive on / drive off ferry and it’s possible to see that the tail is down and a green lorry is on the deck of the ferry. It is also possible to see at least two other boats, but it’s difficult to know the distance the ship has to travel to cross the stretch of water because we don’t know the lens used to take the picture. Knowing the distance may have helped with finding the location.
This was taken on Fujifilm at an unknown date, but the plastic slide mount and the design of the ferry suggests this was probably the 1980s.