Permian Basin Map (IMAGE) Environmental Defense Fund Caption The Permian Basin is the largest oil field on the planet. Tens of thousands of wells dot the 86,000 square landscape that spans West Texas and Southeastern New Mexico. Credit Environmental Defense Fund Photo by Nick Simonite 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.