Hα map in N66 observed by HST (ACS WFC1 archival data, Nota et al. 2006). The units are electrons per second, and the conversion factor 1.99 × 10^-18ergs cm^-2 Ang^-1 electron^-1. We show superposed in black the contours of the [ CII ] integrated intensity (in K km s^-1, integrated over the LSR velocity interval of 141 to 166 km s^-1) from the present work. We have marked the position of the stellar cluster NGC 346 by a green star, detected water masers by blue stars, and the supernovae by red star.