Regular Lightning (IMAGE) University of Washington Caption This map shows the frequency of lightning strikes of all sizes measured by the World Wide Lightning Location Network, with pink being the highest values. Lightning occurs most often over land, with a few so-called "lightning chimneys" that include the Southeastern U.S. and the islands of Southeast Asia. Credit World Wide Lightning Location Network Usage Restrictions With credit 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.