Playa Lagun is a bay in between two cliffs with a little beach. There is a sandplateau where you regularly see coral formations.
The drop-off itself is where you see the dark blue edge, it is a bit of a swim and starts at about 7 meters deep and descends all the way to about 40 meters deep where again the bottom gets sandy.
The reef has a lot of mushroom shaped corals and you can often spot turtles and moray eels. Sometimes you will also come across a turtle or eagle ray.