Somewhere, miles from the ocean, in Portugal. Photo: Andre Carvalho

Nic Von Rupp on a mini-peeler. Photo: Andre Carvalho

When surfing a wave created by a passing ferry, lulls can get somewhat predictable. May as well head in and make a sandwich. Photo: Andre Carvalho

"You need very specific tides, very specific winds, and all this has to match the three-hour time period when the catamarans and boats cross the river the most, which is 7:00-10:00am," Nic Von Rupp (pictured) explains. Photo: Andre Carvalho

Rupp continues: "It's pretty much in the middle of nowhere in an old, ghetto town of abandoned fish factories from the '70s -- with no surfing soul to be found." Photo: Andre Carvalho

And there's a right! (Just need a bigger, faster, heavier ferry.) Photo: Andre Carvalho

It's ain't Pavones, sure. Or even Ponce Inlet. But having a predictable little wave to tear into now and then seems pretty fun to us. Photo: Andre Carvalho

Said freaky wave is found on the Tejo River, which flows into the ocean right by Lisbon. Note the Golden Gate Bridge-esque 25 de Abril Bridge in the background. Photo: Andre Carvalho

As one can imagine, surfing inside a river downstream from a giant city isn't exactly the cleanest experience in the universe. Photo: Andre Carvalho

Lots of down-the-line surfing here; you don't want the wave to pass you by, or you'll have to wait 24 hours for the next one. Photo: Andre Carvalho

Hey, Cap'n, can this thing go any faster? Please? "The wave only breaks when the boat is headed to Lisbon, and not coming from," explains Rupp. Photo: Andre Carvalho

"It's just a small, fast perfect wave, but if you catch one of the big ones you can fully rip it," Rupp explains. "It's hard to read. You never know how big the wave is going to be, so you never know where to place yourself. The wave also breaks in different spots depending on the sand banks and tides." Photo: Andre Carvalho

Trying to generate enough speed to make the section. Milking it. Photo: Andre Carvalho