Many precious lives are lost just off our seashores. In order to decrease the number of drowning accidents, there is a need to conduct research in the coastal waters where the accidents happened, and accumulate onsite knowledge. Along with organizations including the Japan Coast Guard, I conducted research around Japan regarding offshore currents (rip currents, reef currents, etc.) that would present dangers to users of such waters, focusing on the sandy beaches, coral reefs, river mouths and inlets (lake mouths) where drowning accidents had taken place. I also conducted seminars and on site briefings for lifesavers and other officials in more than 20 sites around the country. Here, I would like to introduce some efforts and activities for the safe use of our coastal waters.