Overview of the G35 complex. Panel (a) shows a Spitzer RGB-composite image (24, 8, and 3.6 μm) of the region surrounding MIR bubble N68. Panel (b) zooms in on region R1 in a Herschel RGB-composite (350, 160, and 70 μm). Overlaid on both panels are tracers of massive star formation: MAGPIS radio sources (green crosses), 6.7 GHz methanol masers (red pluses), ATLASGAL 870 μm peaks (blue squares), MSX MYSO candidates (orange dots), and WISE H II regions (cyan circles). The 20 cm radio continuum (magenta contours; levels start from 0.0008 to 0.0088 in steps of 0.0016 Jy beam⁻¹) traces the inner rim of bubble N68, outlined by a white dashed ellipse. White dashed rectangles mark dark clouds identified in X. Shen et al. (2024).