Current plan (2021) of the ground-based coverage of the Euclid sky based on the six most powerful ground-based wide-field imagers and the Euclid RoI (in solid yellow). Vera C. Rubin Observatory (LSST and suggested northern and southern extensions: purple, green, and pink rectangles) and Blanco (DES, red) in the south. Subaru (WISHES), JST (JEDIS-g), Pan-STARRS, and CFHT (CFIS) in the north (orange). The best S/N 2600 deg² areas for Euclid in each Galactic cap (black dotted contours) are key to steering the ground efforts with respect to the mission’s first data release (DR1). The Galactic referential is shown in light green.