Salgado beach known to be 'very dangerous'
A spokesman for the Maritime Authority in Nazare, Portugal said the part of the beach where the incident happened is widely known in the area to be hazardous. He said:
"The sea in that beach is very dangerous. The wave that swept them in was very big.
"The beach has information that tells you about that area where they were and it tells you there's no surveillance, no lifeguards, on that part of the beach. It's very far from where they are stationed."
The beach is a popular spot for big wave surfers.
Beach holidays: Your guide on how to stay safe
The RNLI has some easy to follow advice on how to keep safe on the shores across the UK.
Girl and grandfather drown at a beach in Portugal
A British man and his five-year-old granddaughter have drowned off a beach in Nazare, Portugal.