Engi has an area, as defined by the former municipal boundaries in 2006, of , covering a considerable area on each side of the river. This area reaches up to the peaks of the Gufelstock (), Bützistock (), Magerrain () and Gulderstock () to the east, and the Gandstock () to the west. Of this area, 38.1% is used for agricultural purposes, while 36.1% is forested. Of the rest of the land, 1.2% is settled (buildings or roads) and the remainder (24.6%) is non-productive (rivers, glaciers or mountains).