The world's most extreme zip slide

A video of what is said to be the world's most extreme zip-slide has gone viral online.

The clip of the ZipFlyer Nepal, in the Himalayas, has been viewed 230,000 times on YouTube.

Thrill-seekers reach speeds of up to 100mph on the 1.8 kilometre slide at Sarangkot, near Pokhara.

With a vertical drop of almost 2,000 feet and an incline measured at a sheer 56%, it is one of the tallest and steepest zip-slides in the world.

"As you look down, the adrenaline begins to build up and your heart begins to beat faster," says operator High Ground Adventures on its website.

"Gravity takes care of the "go" portion of the ride, a feeling of weightlessness sets in, the wind gushes against your face, as you plunge at speeds of over 160kmph.

"After a minute of pure adrenaline, and travelling a distance of almost 2km, the ride begins to slow down as you approach the landing.

"The advanced magnetic braking system then brings you to a complete stop."

Riders can see sweeping views of the 23,000ft Machapuchare mountain, the Annapurna range and the Seti River.