Shocking footage shows the terrifying moment a woman almost fell down the Grand Canyon while taking a photo of her mother.
Emily Koford and her mum Erin, of Texas, were visiting the Arizona landmark in October when the scary near-tragedy happened.
Another tourist, Kevin Fox, watched on from a smaller observation deck on the southern rim of the canyon and recorded the video.
In his footage, 20-year-old Emily can be seen backing up to get more of the scenery in to the background of her pic.
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Not watching where she was stepping, and with no guardrail to stop her, her right foot slips off the rock and almost sends her stumbling to the ground below.
Fortunately, she's able to stop herself at the last minute, reaching down to balance herself on the ground with her hands before her mother rushes forward give her a relieved hug.
Fox says the video serves as a lesson to others.
"I wanted to show my kids what not to do. I didn't realise what was going to happen," he says.
"I had taken a picture and then started a video because I wanted to show the full extent of the danger... I show what is below and then come back up to see them walking around on the edge.
"I'm very thankful that both ladies are doing well."
Fox later caught up with Emily and her mother and told them he had captured the footage.
"They were laughing - but in a nervous way."
Emily's mother told local media she had warned her daughter of the nearby cliff edge.
"I saw that the ledge was right there and I said, 'don't take another step back'... My stomach went up into my chest. I was scared and angry all at the same time, so I just went up and grabbed her."
Emily, her mother and Fox were all from Texas and travelled home around the same time, sharing the unbelievable video with friends, family and media.