Garrett McNamara: he surfed a 2.4-mile long wave in Tagus River, Lisbon

Garrett McNamara has ridden the longest wave in the Tagus River in Lisbon, Portugal.

The big wave surfer caught a wake at the Santo Amaro Dock and finished his stunt in Belém.

McNamara spent 10 minutes riding the same wave under sunny skies and surrounded by media professionals.

He used the first minute to get used to the motor-powered wave, and then let the rope go and enjoyed the knee-high wave for 2.4 miles (3.9 kilometers).

But the Hawaiian wanted more than just standing straight and gliding across the wake.

When he accomplished his goal in Belém, Garrett McNamara unleashed a few turns and tricks on his red and black surfboard.

One thing is certain: Garrett Mcnamara, 50, never fell off his board.

"I almost lost it a couple of times. That was definitely the longest ride of my life. That's a way to start the winter. Now, I'm ready for Nazaré," McNamara said after completing the challenge.

"I wanted to turn the whole way, but I waited until the end. Wakesurfing is fun. Everybody should try it."

"It's amazing. There's more to surfing than big waves and the ocean. Now I'm ready to tow all day!"

In November 2011, Garrett McNamara broke the Guinness World Record for the largest wave ever surfed.

The Hawaiian rode a 78-foot mountain of water at Nazaré's Praia do Norte.

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