RCW36 at a distance of 700 pc within the Vela C molecular cloud consists of an H II region with a cavity of ionised gas surrounded by molecular gas, a star cluster inside, and a dust lane that crosses the cavity. An embedded cluster (~350 members) with the most massive star being a type O8 or O9 is located within the cavity.

RCW79 is another example of a Galactic bubble region catalogued in the GLIMPSE (Churchwell et al. 2007) survey. It is suggested that triggered star formation might occur around these bubbles. Based on Herschel data for RCW79, more than 50 compact sources (Class 0 and I)

RCW 49 is powered by Westerlund 2, a compact rich cluster with a dozen early type O stars, 20 later type O stars, and 2 WR stars. It has multiple very strong stellar wind sources which must control the dynamics. The

The common, apparantly circular morphology for many HII regions may indicate that HII regions expand almost uniformly and form 3D bubbles. Then, the small morphological differences between bubbles are likely caused by evolutionary effects coupled with density variations in the ambient medium.

NGC6334 is a very active star forming region with a remarkably large number of H II regions spread across the complex (7 compact and optical H II regions per square degree), most of them with a bubble morphology in the IR and FIR.

The Eagle Nebula (M16) is a young (1-3×10⁶ yr), active, high-mass SF region in Serpens (d~2 kpc). Responsible for heating and ionising the Nebula is the young open star cluster NGC6611, containing four early-type O stars, leading to a high average UV-field of ~G₀ . The transition between HII region and dense, cold gas is rather

M17 is one of the brightest and most massive star forming regions in the Galaxy. It is located at a distance of 1.98 kpc and associated with the highly obscured (A_V > 10) cluster NGC 6618 with more than 100 OB stars. The total mass

The W40 complex is a nearby site of intermediate-mass star formation associated with a cold molecular cloud (~10⁴ M_⊙) and includes a blistered H II region powered by an OB association and two interconnected

W43 is one of the most active star-forming regions in the Galaxy. Its position in the Galactic plane and its radial velocity places it at the junction point of the Galactic long bar and the Scutum spiral arm at 5.5 kpc distance to the Sun.

The Cygnus X region is one of the richest star formation sites in the Galaxy, excited by the Cygnus OB2 cluster that contains well over 100 OB stars. Most of the molecular clouds are located at a distance of 1.4 kpc, the total molecular gas mass is a few 10⁶ M_⊙ and the average density is ~60

NGC 7538 is a relatively nearby region of high-mass star formation and an excellent place to search for the precursors of future high-mass stars. It shows some interesting structures, including a large ring structure visible surounding an IRDC. Fallscheer et al. (2013) report