Toya (IMAGE) Helmholtz Association Caption Lake Toya is a volcanic caldera lake in Shikotsu-Toya National Park on Hokkaido Island in north of Japan. Credit Dr. Bertram Boehrer/UFZ Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.