*Así* is the correct way to write this word. *Hací* Is a barbarism and, therefore, it is convenient to avoid it.
Patagonia (Spanish pronunciation: [pataˈɣonja]) is a sparsely populated region located at the southern end of South America<span>, shared by Argentina and Chile. The region comprises the southern section of the Andes mountains as well as the deserts, pampas and grasslands east of this southern portion of the Andes.</span>