The document discusses a regional spatial data infrastructure (SDI) and viewer created for Lombardy, Italy. The Lombardy SDI platform, called REGIS, provides over 150 map services and 600 geographic layers to citizens, companies, and public administrations. The new Region Lombardy Viewer 2.0 allows users to easily access and build maps from multiple data sources, share custom projects, and fully integrates with the Lombardy SDI services. The viewer is accessed through Lombardy's geoportal and provides a useful tool for governance, analysis, and sharing of regional geographic information.