Some people put pins in a map at their home or office as an indication of the cities they have visited. Others look at the stamps in their passports in order to remember the places they have swum. And a few others use blogs, YouTube, Instagram, Twitter, or Facebook to announce what countries they are heading to, or where they have been.
But one guy has an interesting way, it seems, to keep track of the waterways he has swum – tattoos literally on his back.
Looks like he has most of the Americas, Europe, and Oceania covered.