This is the amazing moment a frozen lake formed a pattern of thousands of icy spheres.
Footage filmed at Lake Manitoba, Canada, on November 20, shows the surface of the water transformed into a bumpy layer of frozen balls that look like rocks or cobblestones.
The rare pattern in the lake makes it look like a giant icy beach, which stretches as far as the eye can see.
It was filmed by local entrepreneur Peter Hofbauer who owns a canoeing company at Steep Rock on the east shore of the lake, around 150 miles from Winnipeg.
It was posted on Instagram by Mr Hofbauer with the caption: ’20th November Lake Manitoba. Have you ever seen the lake freeze like this?’
Replying to comments, he said the ice was around six inches thick and solid, making the surface rough.
In the footage, Mr Hofbauer shows the area next to the limestone cliffs covered with the spheres, which ranged from golf ball to football sized
In the footage was taken on November 20 at Steep Rock, Lake Manitoba, Canada, the ice pattern appears to stretch on for miles and miles next to the limestone cliffs
Peter Hofbauer, a canoe business owner, zooms in on an area of spheres to show the pattern they have formed on the lake
The ice pattern appears to stretch on for miles and miles next to the cliffs as Mr Hofbauer continues walking across it.
Mr Hofbauer told CBC: ‘The water created these balls of ice and they just accumulated against the shore, and it seemed to just spread out over the lake as far as I could see.’
He later said: ‘I’ve never seen ice shaped like that before.’
The ice formation is a rare phenomenon that happens when ice crystals or frazil ice form in turbulent waters which are slightly sub zero.
Speaking to Global News, river ice expert and Stantac hydrotechnical specialist Dr Vincent McFarlane said the frazil ice accumulates and rises up to the water surface.
Strong winds and waves in the area over the past weekend likely rolled up the water into slushy orbs which then froze.
The water has to be open for a brief time but also cold enough on the surface to allow these rare slush balls to form.
Slush spheres are delicate and will not last long when they are picked up which is similar to what would happen if you took a weak snowball and put it in water, according to the glaciologist Jeff Kavanaugh.
Dr McFarlane said: ‘The wave action took these frazil ice accumulations and rolled them up into ball shapes, instead of letting them form … the pans or the pancakes that we would see on the river.
‘It’s something I’ve heard of a couple times before. I know it’s been seen on the Great Lakes (on occasion)
‘I think with the strong winds and big waves, we sort of saw something that was really unique in this scenario.’
The formations are created by chilly water that has less wave influence and when picked up they are weak
Mr Hofbauer had been curious to see what was on the underside of the lake so went out on Monday night and cut out a section to look at the bottom which was smoother.
But he realised soon after he took them that the balls turned into snow.
Mr Kavanaugh said: ‘That’s why they call it slush balls.
‘They’re very much like if you took a snowball — a weakly compacted snowball … and put it in water. They’re pretty delicate.’
There were stick-like formations which were about eight centimetres long and Mr Hofbauer found them along thin ice at the shore.
The formations are created by chilly water that has less wave influence, according to Kavanaugh.
He said in calm conditions the water molecules can arrange into crystals and they grow like needles.
Sometimes it is seen on puddles in pavements after rain and then when it is chilly afterwards.