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With an unprecedented astrometric and photometric data precision, Gaia EDR3gives us, for the first time, the opportunity to systematically detect and mapin the optical bands, the low mass populations of the star forming regions(SFRs) in the Milky Way. We provide a catalogue of the Gaia EDR3 data(photometry, proper motions and parallaxes) of the young stellar objects (YSOs)identified in the Galactic Plane (|b|<30 deg) within about 1.5 kpc. Thecatalogue of the SFRs to which they belong is also provided to study theproperties of the very young clusters and put them in the context of the Galaxystructure. We applied the machine learning unsupervised clustering algorithmDBSCAN on a sample of Gaia EDR3 data photometrically selected on the regionwhere very young stars (t<10 Myr) are expected to be found, with the aim toidentify co-moving and spatially consistent stellar clusters. A subsample of 52clusters, selected among the 7323 found with DBSCAN, has been used as templatedata set, to identify very young clusters from the pattern of the observedcolor-absolute magnitude diagrams through a pattern match process. We find124440 candidate YSOs clustered in 354 SFRs and stellar clusters younger than10 Myr and within about 1.5 Kpc. In addition, 65863 low mass members of 322stellar clusters located within about 500 pc and with ages 10 Myr<t<100 Myrwere also found. The selected YSOs are spatially correlated with the well knownSFRs. Most of them are associated with well concentrated regions or complexstructures of the Galaxy and a substantial number of them have been recognizedfor the first time. The massive SFRs, such as, for example, Orion, Sco-Cen andVela, located within 600-700 pc trace a very complex three-dimensional pattern,while the farthest ones seem to follow a more regular pattern along theGalactic Plane.

Low mass young stars in the Milky Way unveiled by DBSCAN and Gaia EDR3. Mapping the star forming regions within 1.5 Kpc