This website is administered by Tokyo Electric Power Company Holdings, Incorporated (hereinafter, the TEPCO”), and enables users to comprehensively observe sea area monitoring data published by various related ministries and agencies, local governments, and companies, including the Company, on a map. Carefully read and agree to the Terms of use before using the website.

We will continue to gradually expand the available data in order to provide a website for comprehensively observing monitoring results, etc., related to seawater, fish, and seaweed off the coast of Japan. We will also make improvements based on user opinions and requests in order to enhance the ease with which this website can be learned and used.

In addition, we would like to express our deep gratitude to all of the organizations that have made their data available for publication on this website.