Spatial distribution of galaxies with a redshift within z_sys ± 1000 km s⁻¹, for the BLA at z = 0.04866. Left: Full VLT/VIMOS FoV around SDSSJ161940.56+254323.0 at z ≈ 0.04866. The dashed cross represents the separation between the four VLT/VIMOS quadrants, indicated in gray. The central magenta square represents the VLT/MUSE FoV. The VLT/VIMOS FoV spans a square of ∼1.2 Mpc side at this redshift. The VLT/MUSE FoV is significantly smaller, reaching impact parameters of ∼50 kpc from the QSO sightline. Three galaxies in our VLT/VIMOS survey lie within 1000 km s⁻¹ from the BLA. Right: Zoom-out of the left panel, using spectroscopic data from the SDSS DR16 survey. The separation between the VLT/VIMOS quadrants is kept for reference. The colorbar of both panels indicates the velocity offset of each galaxy with respect to z_sys.