Daredevil completes 'highest ever slackline walk over water'

This is the nerve-shredding moment that a German adventurer slacklined across one of the highest lakes in the world.

Alexander Schulz claims his walk over the volcanic glacier at the summit of Mount Sabalan in north-west Iran is the highest-ever elevated slackline over water.

Sabalan stands at 4,811 meters above sea level (MASL), which puts it higher than Mont Blanc, according to local media.

Schulz successfully walked 68 metres without falling, alongside three other members of his team.

Schulz says he and his team slept in tents in the crater of the volcano during their expedition.

"Besides being good for records, it gets more and more clear to me that volcanoes are the coolest places to slackline. I definitely enjoyed those intense two days that we spent at this one," Schulz said.