Here are the famous Horizontal Falls in the Kimberley Region of Western Australia. I’ve never been there myself – hope to one day!
This particular spot is where the massive tides of the area get jammed through a rather small gap, creating a Horizontal Waterfall. When the tide turns, the water ‘falls’ back in the other direction.
At the time the satellite took the photo, it was looking a bit tame, things get more serious in the middle of the tidal run. Some nice photos here.