A couple said to be from Australia and the United Kingdom were presumably taking a picture on a 30-meter-high wall overlooking a picturesque beach when they allegedly lost their balance and fell off a cliff in Portugal.
"It seems they dropped their mobile phone and fell down while leaning over to retrieve it", he added.
Praia dos Pescadores - or Fishermans Beach - on Portugal's Atlantic coast, is around 25 miles from Lisbon and is popular with tourists and surfers.
The couple are believed to be from Britain and Australia.
Tourists have plunged from the wall before and locals have asked for security measures to be implemented, according to the Telegraph UK.
Ms Benson, also a keen diver, regularly took to social media to share photos of her overseas journey - including snaps of a dive the pair enjoyed in Sri Lanka in February.
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Cops have sealed off the beach while investigations continue into exactly what happened.
The head of the rescue service at Cascais port near Lisbon, Rui Pereira da Terra, told the Lusa news agency that it was suspected that couple had been taking a selfie on a wall above the beach.
The Foreign Office confirmed a British woman had died and the Australian Department of Foreign Affairs (DFAT) and Trade said an Australian had lost their life.
"Owing to our privacy obligations we will not provide further comment".
Its beach is ringed by cliffs and a 40-metre high wall.
A Foreign and Commonwealth Office spokesperson said: "We are in touch with local authorities following the death of a British woman in Portugal and are providing support to her family". Picture: SuppliedThe large stone wall sits 30m above the popular surf beach.