Vel OB1 association: the extension on the sky according to the limits proposed by Reed (2000). Indicated are several young stellar clusters embedded in this region, within the distance interval of about 1.6 to 2.5 kpc. Some star-forming regions and clusters (not labelled) are in the foreground to Vel OB1, e.g. Vel OB2 (just below the plotted region at 410 pc) and RCW 36 (l = 265.1, b = 1.4, at a distance of 700 pc). The background image is a colour composite of the AllWISE survey in bands W1, W2, and W4. Milky Way Star Cluster № 1594 ([KPS2012] MWSC 1594, Kharchenko et al. 2013) is indicated as Cl 1594.