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We present a study of the kinematic properties of the ionized gas in thedominant giant HII region of the well known HII galaxy: II Zw 40. High spatialand spectral resolution spectroscopy has been obtained using IFU mode on theGMOS instrument at Gemini-North telescope. We have used a set of kinematicsdiagnostic diagrams, such as the intensity vs. velocity dispersion intensityvs. radial velocity, for global and individual analysis in sub-regions of thenebula. We aim to separate the main line broadening mechanisms responsible forproducing a smooth supersonic integrated line profile for the giant HII region.The brightest central region (R ~ 50 pc) is responsible for sigma derived froma single fit to the integrated line profile. The dominant action of gravity,and possibly unresolved winds of young (<10 Myr) massive stars, in this smallregion should be responsible for the characteristic Halpha velocity profile ofthe starburst region as a whole. Our observations show that the complexstructure of the interstellar medium of this galactic scale star-forming regionis very similar to that of nearby extragalactic giant HII regions in the LocalGroup galaxies.

The Internal Kinematics of the HII Galaxy II Zw 40