Several commenters pointed out that the undated photo was likely taken at Stingray City, a popular tourist destination in the Cayman Islands where swimmers and snorkelers are encouraged to feed ground squid to the rays from a sandbar.
"Come kiss a stingray with us this year!" an offer on boat charter service StingrayCityTrips.com reads. "Standing in only three feet of water you will be surrounded by more than two dozen friendly stingrays."
According to Cayman.org, the spot has become populated with rays because local fishermen dispose fish offal there. The site in Grand Cayman's North Sound became popular in the late 1980s after it was featured in Skin Diver magazine.
The site also offers some helpful tips on how to "survive" a stingray trip, including:
If you dive or deep snorkel, wear a "skin" or light wet-suit to protect from stingray "hickies." Stingrays cannot see what they are feeding upon and they eat by sucking the food into their mouths between two hard dental plates. Sometimes they can get confused by all the feeding going on, and since they don't feed by sight, they just start sucking as they approach the food source (divers).
Remember, the ray hunts by sense of smell so you can lead a ray around for quite a while with just one piece of bait—actually just long enough to get bushwhacked by another ray coming in from another angle.
Many folks just let go of the bait the first time or two—the ray misses the fish and it gets taken by one of the ever-present Cayman Piranha. These fish are actually the real threat here, they can come and give you a rather sharp bite on the finger to help encourage you to give them the bait.