That’s what I remember.
Or at least there’s a couple that spend time near a beach somewhere. But there’s definitely a dead seal there, in one shot the woman turns around, sees the seal’s corpse in front of her and screams. I could be confused and she was just surprised to see a dead animal, but I’ve it in my head that the seal popped up all over the place.
It can’t be that recent a movie, no later than the 80s, maybe early 90s tops. And the couple are white, possibly Australian. Possibly.