Footage shows frightened holidaymakers at Navagio, Zante abandoning their belongings as they desperately scrambled across the sand to safety.
Wendy Thorpe from Newcastle, recalled seeing elderly holidaymakers "covered in blood" as rocks created huge waves and washed them out to sea.
The 53-year-old mum had just arrived with her daughter Paris, to take photographs for her modelling portfolio when they heard an "almighty crash".
She told Sun Online: "It was like a scene out of a horror movie. People on the beach were screaming with panic as a second round of rocks began to fall.
"A smaller boat capsized and I could hear horrible screams saying a few people were trapped under the boat.
"Huge clumps of the rubble literally fell on top of people.
"I saw a couple taking funny pictures just before the rocks fell, and I could not see them afterwards, for the life of me.
"There were no coastguards to be seen. It was just us holidaymakers helping each other."
Carrie Anne Coleman, from Essex, said she was "knocked off" her feet by the second and much bigger rockfall.
She told Sun Online: "It was absolutely terrifying. It all happened so quickly. I tried to run but the waves knocked me off my feet.
She added: "The smaller rock face fell at around 11am, and minutes later a much bigger one turned boats over causing massive waves."
One video shows boats packed with tourists swerving past each other, in a bid to speed across the water to avoid the tumbling boulders.
Thick clouds of dust, sand and debris filled the beach, sparking panic on the beach, as dozens struggled to find their loved ones.
A spokesperson from Zante's fire department said: "So far, we haven't found any trapped people but we will continue searching."
One family narrowly miss appeared to be relaxing on towels narrowly missed being struck by a huge boulder.
An eyewitness told the ANA agency: "There was a rumble and a rock fell, followed by a larger rock and then another."
The video showed a wall of rock peeling from the cliff and falling on tourists below.
A couple of small boats overturned as the force of the fall caused high waves, witnesses told authorities.
A Czech woman suffered back injuries and was transferred to hospital.
Another six people, including two children, received treatment for minor injuries, a hospital official told Reuters.
The Ionian island of Zante, also known as Zykanthos, is popular with British holidaymakers.
One of its main attractions is a shipwreck on the shore at Navagio.
The beach is surrounded by steep cliffs and can only be reached by boat.
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