Swimming is one of life’s most simple pleasures; taking a cool dip on a warm day is an incredibly satisfying sensation. While most pools, lakes and oceans are totally safe to swim in, there are the odd exceptions to the rules. Whether it is deadly creatures lying in wait under the surface, filthy water that could give you all sorts of diseases or strong currents that could pull you to your death, there are certain waters that even the strongest swimmers should avoid. The following is a list of 15 of the most dangerous places to swim on the planet. Enter at your own risk!