New survey reveals country's top 5 spots for a splash

Sea or the chilly Atlantic Ocean.

- 

From better sleep to reduced inflammation and even a natural high, sea swimmers swear by the routine of plunging themselves in the freezing water.

It has been proven to help clear the mind of worries and anxieties and can alleviate physical ailments including arthritis.

However, safety is key when it comes to open water swimming.