During this extraordinary event, which starts with a shot of vodka to appease the the spirits of the Great Baikal, runners race along the surface of Lake Baikal in pre-chiseled tracks though fields of 'hummocks' - small hills of ice rubble - that are scattered on the lake's surface.
It's a gruelling, bone-chilling, physical exertion that photographer and writer Ed Graham knows well, having participated in the 2013 Ice Marathon earlier this year.
Graham first encountered the Lake Baikal race over a year ago during his first journey on the Trans Siberian Railway and his love of extreme travel persuaded him to sign up for the marathon.
He writes about his experience in his blog, The Polar Route: "I said "screw it" and I signed up for it anyway, knowing I could always back out. Soon after, one of my best friends and a good travel buddy unexpectedly passed away from cancer diagnosed just two weeks before he died."
"He was a guy who always lived life to the fullest both at home and on the road, and his grand adventures had continually inspired me to do the same. Attempting this race would be my own version of living a full life, and I knew then that I had to complete it."
Graham completed the marathon in March and managed to take some incredible pictures while he was at it.
Have a look at his astonishing photographs of ice gems glowing in the sunset and the vast, black-ice expanse of the frozen Lake Baikal below.
Have you signed up for a marathon this year or do you fancy taking on Siberia's Ice Marathon after seeing these pictures? Tell us below.
The Baikal Ice Marathon in pictures
In pictures: Siberia's Ice Marathon
The run starts from the opposite side of the lake and ends in Listvyanka, a town on the shores of the vast water source, 60 km south-east of Irkutsk in Siberia.
Ed Graham: "Looking across Lake Baikal along the marathon path. Shot at sunset the day after the race."
The surface of the frozen lake is peppered with 'hummocks' - small hills of ice rubble.
Lake Baikal, The 'Galapagos of Russia' can be found in south-east Siberia. This 3.15-million-ha lake is the oldest and deepest in the world. It's listed as a UNESCO World Heritage Site, is 25 million years old and contains 20 per cent of the world's total unfrozen freshwater reserve.