Upper panel: image of M8 taken with the WFI attached to the MPG/ESO 2.2 m telescope at the La Silla Observatory. The image is based on the maps observed with three different broadband filters: B (at ~456.252 nm), V (at 539.562 nm), and R (at 651.725 nm) and one narrow-band filter: H α (at 658.827 nm). Lower panel: map of M8 at 450 μm adopted from Tothill et al. (2002, Fig. 2). The boundaries of the observed maps shown in Fig. 3 are marked in red (Fig. 3, top row) and blue (Fig. 3, middle and bottom rows). Our observed maps extend farther to the east, beyond the edge of this image. The boundary of the observed maps of various species reported in Tiwari et al. (2018) is shown as yellow dots. The positions of the luminous stellar systems Her 36 and 9 Sgr, which are located in the central optically bright region of M8, are marked in both panels, along with the position of the open cluster NGC 6530 and the eastern star-forming region M8-E.