When we think of shark infested waters, we don't usually think about tourist destinations like Frazer Island - the largest sand island in the world which is also world heritage listed, but here is an example of why not to go for a swim in the ocean.
These pictures were taken by my Dad when we were on a family holiday at Frazer Island many years ago. I just found them the other day when I was going through some old photos.
What's that dark shadow on the water out there?
You guessed it. It's a Shark! about 4 metres long swiming in knee deep water.