eFEDS X-ray and multi-wavelength coverage. The thick blue line shows the outer bound of the region that was searched for X-ray sources. The thin beaded blue line shows the region with at least 500 seconds of effective X-ray exposure depth. We indicate the approximate coverage of several selected surveys that are particularly important for this work: Subaru HSC-Wide (shaded green region), KiDS/VIKING (dashed magenta box), GAMA09-DR3 (hatched red box). The eFEDS field is also covered in several other important surveys that completely (or almost completely) enclose the displayed region: e.g., the Galex all-sky surveys (in the UV), Gaia (in optical), Legacy Survey DR8 (optical combined with Gaia and WISE), VHS, and UKIDSS (in the near-infrared), WISE/NEOWISE-R (in the mid-infrared), and the SDSS (optical imaging and spectroscopy).