We report first results on the large-scale distribution of the ROSAT All-Sky Survey (RASS) X-ray sources in a 5000 deg^2 field centered on Orion. Our final aim is to study the properties of different widespread populations in the Orion Complex close to the Gould Belt (GB) in order to trace the star formation history in the solar neighbourhood. ; Comment: 3 pages, 1 figure. To appear in the Proceedings of "Stellar Clusters and Associations - a RIA workshop on Gaia", 23rd-27th May 2011, Granada, Spain