People going to the Brecon Beacons are being urged to take care when visiting Waterfall Country and surrounding rivers after two deaths and a high number of emergency callouts to the area this year.
Each year more than four million people visit the park but the National Park Authority wants visitors to come prepared as the hazards posed by the spot should not be underestimated.
Lower leg injuries and exhaustion are said to be common problems and the National Park Authority says this can often be prevented by wearing sturdy shoes and suitable clothing as well as staying hydrated, especially on hot days.
People are also being advised to be extremely careful if they choose to swim in the water, with river temperatures being very low and posing the risk of cold water shock.
If you suffer cold water shock, you should float on your back until you can control your breathing and then call for help and find something to help you float or swim to safety.
The CEO for the Brecon Beacons National Park, Catherine Mealing-Jones has said it is terribly sad to hear of the tradgedies that have happened in the park.
"Our thoughts lie with all families and friends of those who have suffered such misfortune.
"We want to raise awareness of the dangers that visitors may face to help avert future incidents and encourage anyone visiting the area to come prepared."