Spatial distribution in heliocentric Galactic coordinates (X_HC, Y_HC) of known open clusters (gray points) from the UCC catalog (Perren et al. 2023). The plot covers the region 290° < l < 350° and −1° < b < 1°, corresponding to a prominent section of the Carina-Sagittarius Arm. The colored curved lines represent the Hou & Han (2014) spiral structure of the MW. The thick black circle highlights the specific region we investigated, centered at l = 322°, which is characterized by a noticeable lack of known clusters and limited prior deep exploration.