Galactic distribution of the previously known SNRs (blue-green, from both the G22 and SNRCat samples), SMGPS SNR candidates (light green filled), and previously known SNR candidates (green open). The circles are representative of the SNR sizes. Only sources confirmed here are shown. The background is a two-dimensional histogram of the H II region density from the WISE Catalog, with higher densities indicated by darker shades.