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Archeologists in Mexico have discovered a huge, lost Mayan city, which they named Valeriana, hidden deep in the southern jungle of Campeche -- a sprawling, urban settlement, replete with architectural marvels and agricultural infrastructure.The discovery of what appears to have been a bustling urban landscape challenges the existing knowledge about the prevalence and density of ancient Mayan settlements. Valeriana was discovered by chance thanks to Lidar, or Light Detection and Ranging, a technology that uses lasers to map and analyze archaeological landscapes. The dataset used for the study came from approximately 122 square kilometers (47 square miles) of high-quality airborne Lidar data collected in 2013 as part of a forest monitoring project called Alianza and led by the Nature Conservancy in Mexico, to reduce emissions from deforestation and degradation.