The Mojave Desert Ecosystem Program (MDEP) represents the first joint DoD/DOI attempt to create a uniform geospatial data coverage across a scientifically defined ecoregion. The goal of the MDEP is to develop and implement an Internet-accessible database of GIS-based land management information to facilitate data collection, storage, transfer, sharing, and analysis by all interested parties. It is a multiagency effort, transcending administrative and geopolitical boundaries, designed to enable informed decision making for sustainable land management across a 44,000-square-mile ecoregion.