'The Mountain' Deadlifts 1,042 POUNDS ... Insane Feat Of Strength

Strongman and actor Hafthor Bjornsson -- aka "The Mountain" from 'Game of Thrones' -- picked up a barbell weighing 1,042 FREAKIN' POUNDS ... and it's straight-up ridiculous!!

Thor -- who's 6'9" and 400-ish lbs. -- is a legendary strongman. He won the World's Strongest Man, Europe's Strongest Man and Arnold Strongman Classic ... all in 2018.

So, he's literally the strongest person in the world (4x WSM winner Brian Shaw and '17 WSM champ Eddie Hall might disagree).

The lift went down earlier this week at Bjornsson's gym in his home country of Iceland ... and according to Thor, it's the heaviest deadlift ever done in a gym.

BTW, Thor ain't the only guy in the room with superhuman strength ... the ripped shirtless dude is YouTube star/powerlifter/bodybuilder/strongman Larry Wheels -- who was throwin' around 220 lb. dumbbells earlier this week.

Just watching this will make you stronger.