Navagio is one of the island's main attractions, with the beach featuring a shipwreck on the shore.
A rockfall at the popular Navagio Beach on the Greek island of Zakynthos on Thursday has resulted in at least seven people being injured.
Josh O'Connell, 21, of Kilkenny, Ireland, who works for a tour company on Zante, said there were more than a dozen tourist boats in the bay and 400-500 people in the area.
Rescuers from the local coast guard and the fire department soon arrived on the scene to evacuate the beach and prevent boats from approaching.
The whole beach is surrounded by steep cliffs and can only be reached by boat.
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The first tropical storm-force winds of at least 39 miles per hour (63 kph) were forecast to hit the coast on Thursday. Hurricane and storm surge warnings are in place from South Santee River, South Carolina, to Duck, North Carolina.
The brief video clips included below show the moment the rockfall began, with tons of rock breaking away from the cliff face and falling onto the crowded beach in Zante.
Rescue teams with sniffer dogs have reportedly been dispatched to help local authorities search for the missing. "We heard a sound and a small part of the rock fell, then a second one, and finally a third and large piece dropped in the sea, creating turbulence that overturned the boats", a witness reported.
Among those injured was a 34-year-old woman from the Czech Republic, who suffered a fractured vertebra.
Her husband and two children were hospitalised with minor injuries.
The beach is also known as Shipwreck Beach.