Affleck is seen only from the back in the photo, wearing blue swim trunks and drying his face with a towel, but it's the back-covering phoenix tattoo that is the real attention grabber here.
The mythic tale of this unexpected tattoo dates all the way back to July of 2015, when photogs caught their first glimpse of the bottom portion on Affleck's tattoo on his lower back amidst his just announced divorce from ex-wife, Jennifer Garner.
The legend grew in December, when a better look at the tattoo was caught on the set of his self directed and starring drama Live By Night. A source told ET that the actor got a tattoo inside his wing of Garner's home in Los Angeles, while staying there during their split (the home had been separated into separate areas at the time). The tattoo appeared to be a very large phoenix, a folkloric creature associated with rebirth, and it was speculated at the time to be for his role in the movie.
"I have a lot of tattoos. It's true, I do," he told ET at the time. He also claimed that there hadn't been "a good representation of it in the media" and that there was a reason he hadn't shown the ink off himself.
"I don't have them places where you can see them, because that's private," he said.
And with that, the mystery of the tattoo was somewhat settled, and hidden away until now.
But there's no avoiding showing off that ink, as well as other tattoos, as Affleck films shirtless scenes on the beach alongside co-stars Charlie Hunam, Garrett Hedlund and Oscar Isaac.