In a recent survey for baryonic matter at large scales in the Corona Borealis Supercluster, using the Sunyaev-Zeldovich (SZ) effect, it has been found SZ evidence (Génova-Santos et al. 2005, Battistelli et al. 2006) for a potentially large amount of warm/hot plasma towards the center of this supercluster, in a region where there are no known clusters of galaxies. We investigate the distribution of galaxies in the SDSS for this region and compare it with observations of known clusters and with various control fields in the Corona Borealis Supercluster and in other regions. Our analysis provides evidence for an excess in the number density of galaxies (down to completeness magnitude r ≤ 20) in the location of the two strongest SZ spots observed with the Very Small Array as compared with the average density of galaxies towards the Supercluster which is already a factor two higher than the density of background control fields. The overdensity in the SZ spots is however smaller than in known clusters members of the Supercluster (Abell 2065, Abell 2089, Abell 2061). Our findings support the existence of a broadly distributed population of galaxies in the two SZ spots with colours consistent with membership in the Corona Supercluster.