Why you MUST stay away from the water if you see ‘square waves’

BEACHGOERS who see "square waves" while on holiday should get out of the water immediately.

Also known as cross seas, they may look pretty but are actually extremely dangerous – and have even caused shipwrecks.

Square waves can be found out in the open ocean as well as near the coast, and are formed by waves moving in opposite directions.

This happens when two separate weather systems collide.

The waves then create a chequerboard affect on the sea, with a grid system of squares on the surface.

They look gentle from above, but are actually similar to rip tides, which are extremely hard to escape from.

Anyone caught in the water is likely to struggle to escape them, as they will be fighting two different waves at the same time.

According to the European Space Agency, cross waves which in open waters have even caused a number of shipwrecks over the years due to the battling waves.

If you do want to see the waves – from a safe distance on land – they can often be spotted in France on the Isle de Re, according to Travel + Leisure.

Located near Rochelle, tourists can climb the lighthouse to see the phenomenon from above.

Here are the top 50 beaches in the UK, according to a new study, with many located in Cornwall.

We've also rounded up some of the cheapest beachfront hotels with views of the sea.

Travelling is off the cards right now, but you can add them to your bucket list for the summer.

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