A Freshwater Lake in the Boreal Shield (image) University of Cambridge Share Print E-Mail Caption This is a lake in Canada's Boreal Shield, near Sudbury, Ontario, with aquatic plants in the foreground providing fuel for methane production. Credit Andrew Tanentzap Usage Restrictions Please credit. Share Print E-Mail 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.