Swimming is a pleasant way to get physical exercise and reduce stress. Unfortunately, however, recreation in outdoor water bodies is not always safe.
You should never dive into unfamiliar water. Have a look first to make sure there are no underwater obstacles (stones, pieces of iron, sharp branches or shallow water). Avoid rapid waters and never go swimming by yourself.
Mountain rivers can run very fast, and can sweep even a good swimmer away. The bed and banks of such rivers can be stony, and you can get badly hurt if you fall.
At the seaside, always pay attention to the waves, which can easily knock you over. Be extra careful near breakwaters, and stay well within the safe swimming area marked by buoys.