Planck CMB lensing map, smoothed with a Gaussian filter of FWHM = 0.5°. The DESI Legacy Survey footprint is overlaid, indicating the region where voids are identified and cross-correlations are performed. The footprint is divided into North and South regions, corresponding to the North and South Galactic Caps. CMB regions with negative and positive convergence values are represented by the blue and red ranges of the color palette, respectively.