The locals know the region and all the natural phenomena that can happen there. For this reason, it is advisable to ask the local inhabitants about the dangers of water in the area because they can inform you about the presence of sharks or very strong waves. This can prevent you from suffering an accident or a serious injury.
An important safety reason that one can ask to the locals in regard to the water hazards in an area would be that it can prevent an injury or an accident. Hope this answer would then be of big help.
