Left: Hα emission (data by Finkbeiner 2003) toward the Coalsack Loop. Right: Hα emission (red) combined with H i 21-cm emission (blue) and 100 μm DIRBE far-IR emission (green) for the same region. The solid-line ellipse outlines the H i shell GSH 305+01-24 discovered by McClure-Griffiths et al. (2001). The H i 3D-datacube of the region were taken from The Southern Galactic Plane Survey (McClure-Griffiths et al. 2005). Here the − 24 km s^-1 channel of H i emission is shown. The position of the shell GSH 305+04-26 (labeled in italics) recently proposed by Corti et al. (2012) is outlined by a dotted line. See text for discussion. See the electronic edition for a color version of the figure.