Large Magellanic Cloud. The underlying image is the Hα MCELS map (Smith & MCELS Team 1998). Panel a shows the coverage of the ongoing APEX CO line Legacy Survey (white line) analysed in this work and (in yellow-green) the contours of the CO moment-zero map, with the level corresponding to the signal-to-noise threshold of S/N = 2 in the masked CO data. The moment-zero contours overlapping with Hα-bright regions (see Sect. 3) are highlighted in blue. The 30Dor region is marked by the pink circle with a radius of 100 pc that is centred on the position of R136. Panel b is a zoom into the 30Dor region. The positions of the molecular clouds are shown by X marks.